History Analysis / AsteroidThicket

The main problem with the AsteroidThicket trope in RealLife is, of course, [[SciFiWritersHaveNoSenseOfScale the sheer size of space]]. Even if the number of known asteroids is in the hundreds of thousands, down to those that have sizes comparable to that of a car, and if one includes even smaller bodies the numbers could very well be in the millions or more the space is so vast that if you were to cross the Solar System you'd be very lucky to find something larger than specks of space dust[[note]]The Sun aside, if you explored the sky with a telescope you could notice that some "stars" moved respect to the sky's background -planets or asteroids-. While your telescope could resolve the former into distinct bodies, the latter unless you had a ''really'' big one and/or were quite close would continue looking like stars[[/note]], and as stated in the main page you'd be very lucky to traverse the asteroid belt and find an asteroid that looked like anything but a star (unless your trajectory was designed with that in mind, as per some probes like [[https://en.wikipedia.org/wiki/951_Gaspra Galileo with the asteroid Gaspra]]). The belt during the good ol' days when the Solar System was forming was ''much'' more rich in stuff than now, but even then as we'll see below the AsteroidThicket was averted. The [[https://en.wikipedia.org/wiki/Edgeworth–Kuiper_belt Kuiper belt]] and especially the [[https://en.wikipedia.org/wiki/Oort_cloud Oort cloud]] are thought to be far more massive than the inner asteroid belt, where most asteroids are confined, but there's ''a whole lot'' of space to fill and thus are even more sparse[[note]]The [[https://en.wikipedia.org/wiki/Jupiter_trojan trojan asteroids]], that precede and follow Jupiter in their orbit are thought to be packed more densely than asteroids on the main belt. However, they're still a far cry of fictional ones[[/note]][[note]]Jupiter's gravity expels asteroids from [[https://en.wikipedia.org/wiki/Kirkwood_zones some zones]] on the belt, thus increasing the density in some parts, but it's still not enough to have something as dense as the fictional examples[[/note]].

To give an example of how empty the real asteroid belt is, imagine Ceres -the largest body there- is a small rock with a diameter of 1 centimeter. The asteroids (remember Ceres is now considered a minor planet) would be from a couple of pebbles to finer and finer sand grains that would require a microscope to spot them. Now, the asteroid belt is estimated to have between 700,000 and 1,700,000 bodies down to a size of 1 kilometer.
Does sound impressive, right? Well, in one hand the main part of the asteroid belt at this scale would extend between a radius of 3.2 kilometrs and 5.1 kilometers from the Sun, that would be a ball with a diameter of 14.5 meters -ie, as tall as a tree- and in the other it's estimated that a good handful of sand may contain several hundred thousand of grains. Scatter all those pebbles as well as a few of those handfuls of sand in that area and have fun finding one in a casual walk[[note]]These calculations assume TwoDSpace. In reality they'd be up to meters above and below, thus being even more sparse[[/note]]. It's easy to understand why no space probe sent to cross the asteroid belt has ever been lost colliding with one, and especially why UsefulNotes/{{NASA}}'s ''[[https://en.wikipedia.org/wiki/Dawn_(spacecraft) Dawn]]'' spacecraft's controllers did not have to emulate Han Solo.

Does sound impressive, right?. Well, in one hand the main part of the asteroid belt at this scale would extend between a radius of 3.2 kilometrs and 5.1 kilometers from the Sun, that would be a ball with a diameter of 14.5 meters -ie, as tall as a tree- and in the other it's estimated that a good handful of sand may contain several hundred thousand of grains. Scatter all those pebbles as well as a few of those handfuls of sand in that area and have fun finding one in a casual walk[[note]]These calculations assume TwoDSpace. In reality they'd be up to meters above and below, thus being even more sparse[[/note]]. It's easy to understand why no space probe sent to cross the asteroid belt has ever been lost colliding with one, and especially why UsefulNotes/{{NASA}}'s ''[[https://en.wikipedia.org/wiki/Dawn_(spacecraft) Dawn]]'' spacecraft's controllers did not have to emulate Han Solo.

The main problem with the AsteroidThicket trope in RealLife is, of course, [[SciFiWritersHaveNoSenseOfScale the sheer size of space]]. Even if the number of known asteroids is in the hundreds of thousands, down to those that have sizes comparable to that of a car, and if one includes even smaller bodies the numbers could very well be in the millions or more the space is so vast that if you were to cross the Solar System you'd be very lucky to find something larger than specks of space dust[[note]]The Sun aside, if you explored the sky with a telescope you could notice that some "stars" moved respect to the sky's background -planets or asteroids-. While your telescope could resolve the former into distinct bodies, the latter unless you had a ''really'' big one and/or were quite close would continue looking like stars[[/note]], and as stated in the main page you'd be very lucky to traverse the asteroid belt and finding an asteroid that looked like anything but a star (unless your trajectory was designed with that in mind, as per some probes like [[https://en.wikipedia.org/wiki/951_Gaspra Galileo with the asteroid Gaspra]]). The belt during the good ol' days when the Solar System was forming was ''much'' more rich in stuff than now, but even then as we'll see below the AsteroidThicket was averted. The [[https://en.wikipedia.org/wiki/Edgeworth–Kuiper_belt Kuiper belt]] and especially the [[https://en.wikipedia.org/wiki/Oort_cloud Oort cloud]] are thought to be far more massive than the inner asteroid belt, where most asteroids are confined, but there's ''a whole lot'' of space to fill and thus are even more sparse[[note]]The [[https://en.wikipedia.org/wiki/Jupiter_trojan trojan asteroids]], that precede and follow Jupiter in their orbit are thought to be packed more densely than asteroids on the main belt. However, they're still a far cry of fictional ones[[/note]][[note]]Jupiter's gravity expels asteroids from [[https://en.wikipedia.org/wiki/Kirkwood_zones some zones]] on the belt, thus increasing the density in some parts, but it's still not enough to have something as dense as the fictional examples[[/note]].

Does sound impressive, right?. Well, in one hand the main part of the asteroid belt at this scale would extend between a radius of 3.2 kilometrs and 5.1 kilometers from the Sun, that would be a ball with a diameter of 14.5 meters -ie, as tall as a tree- and in the other it's estimated that a good handful of sand may contain several hundred thousand of grains. Scatter all those pebbles as well as a few of those handfuls of sand in that area and have fun finding one in a casual walk[[note]]These calculations assume TwoDSpace. In reality they'd be up to meters above and below, thus being even more sparse[[/note]].

The main problem with the AsteroidThicket trope in RealLife is, of course, [[SciFiWritersHaveNoSenseOfScale the sheer size of space]]. Even if the number of known asteroids is in the hundreds of thousands, down to those that have sizes comparable to that of a car, and if one includes even smaller bodies the numbers could very well be in the millions or more the space is so vast that if you were to cross the Solar System you'd be very lucky to find something larger than specks of space dust[[note]]The Sun aside, if you explored the sky with a telescope you could notice that some "stars" moved respect to the sky's background -planets or asteroids-. While your telescope could resolve the former into distinct bodies, the latter unless you had a ''really'' big one and/or were quite close would continue looking like stars[[/note]], and as stated in the main page you'd be very lucky to traverse the asteroid belt and finding an asteroid that looked like anything but a star (unless your trajectory was designed with that in mind, as happened with some probes like [[https://en.wikipedia.org/wiki/951_Gaspra Galileo with the asteroid Gaspra]]). The belt during the good ol' days when the Solar System was forming was ''much'' more rich in stuff than now, but even then as we'll see below the AsteroidThicket was averted. The [[https://en.wikipedia.org/wiki/Edgeworth–Kuiper_belt Kuiper belt]] and especially the [[https://en.wikipedia.org/wiki/Oort_cloud Oort cloud]] are thought to be far more massive than the inner asteroid belt, where most asteroids are confined, but there's ''a whole lot'' of space to fill and thus are even more sparse[[note]]The [[https://en.wikipedia.org/wiki/Jupiter_trojan trojan asteroids]], that precede and follow Jupiter in their orbit are thought to be packed more densely than asteroids on the main belt. However, they're still a far cry of fictional ones[[/note]][[note]]Jupiter's gravity expels asteroids from [[https://en.wikipedia.org/wiki/Kirkwood_zones some zones]] on the belt, thus increasing the density in some parts, but it's still not enough to have something as dense as the fictional examples[[/note]].

In planetary ring systems, things are somewhat different since in one hand the gravity of the planets they surround [[https://en.wikipedia.org/wiki/Roche_limit stops them of coalescing to form a larger body]] and circularizes the orbits of the space debris that forms them, this without including the role of [[https://en.wikipedia.org/wiki/Shepherd_moon shepherd moons]], minimizing the collisions between the bodies that form them at least to a point[[note]]Even so, Saturn's rings are far from being static and are thought to be formed of aggregates of small boulders ("rubble piles") that are broken down by collisions, later merging again and so on[[/note]]

Nonetheless, there's still ''some'' room to have a dense asteroid field. One belt where what has been stated above that occurs in Saturn's rings, with rubble piles forming and being broken down later, happens, is massive, ''and'' orbits very close to a star (preferably a very small one as a [[https://en.wikipedia.org/wiki/White_dwarf white dwarf]], better than a [[https://en.wikipedia.org/wiki/Red_dwarf red dwarf]] or a [[https://en.wikipedia.org/wiki/Brown_dwarf brown dwarf]]) could have AsteroidThicket-like density. However besides being ''very'' hot there, orbiting so close to its star, and small with a size of "just" a couple million kilometers at the largest it would rather look like a planetary ring[[note]]Even complete with shepherd moons and zones with very little or no bodies[[/note]] but surrounding a star instead of a planet -especially in the case of the white dwarf, as they have a size comparable to that of Earth.-

The main problem with the AsteroidThicket trope in RealLife is, of course, [[SciFiWritersHaveNoSenseOfScale the sheer size of space]]. Even if the number of known asteroids is in the hundreds of thousands, down to those that have sizes comparable to that of a car, and if one includes even smaller bodies the numbers could very well be in the millions or more the space is so vast that if you were to cross the Solar System you'd be very lucky to find something larger than specks of space dust[[note]]The Sun aside, if you explored the sky with a telescope you could notice that some "stars" moved respect to the sky's background -planets or asteroids-. While your telescope could resolve the former into distinct bodies, the latter unless you had a ''really'' big one and/or were quite close would continue looking like stars[[/note]]. The [[https://en.wikipedia.org/wiki/Edgeworth–Kuiper_belt Kuiper belt]] and especially the [[https://en.wikipedia.org/wiki/Oort_cloud Oort cloud]] are thought to be far more massive than the inner asteroid belt, where most asteroids are confined, but there's ''a whole lot'' of space to fill and thus are even more sparse[[note]]The [[https://en.wikipedia.org/wiki/Jupiter_trojan trojan asteroids]], that precede and follow Jupiter in their orbit are thought to be packed more densely than asteroids on the main belt. However, they're still a far cry of fictional ones[[/note]][[note]]Jupiter's gravity expels asteroids from [[https://en.wikipedia.org/wiki/Kirkwood_zones some zones]] on the belt, thus increasing the density in some parts, but it's still not enough to have something as dense as the fictional examples[[/note]].

A planetary system in formation would be closer to this trope, at least while it lasted (see next paragraph). However it would probably look like more as "lots of stars more or less bright depending of closeness and size moving in front of the background, real, stars and some large bodies that, when close, would appear with some luck when using a telescope or (much rarely) to the naked eye as more than just points of light", instead of rock fragments as far as the eye can see, as it was a big planetary ring.

A rather unpleasant side effect of dense asteroid belts is that those collisions among large asteroids that break them producing [[AsteroidsMonster lots of smaller ones]], that may end up being expelled from the belt into orbits that would carry them to bad places for both the health of those smaller asteroids as well as the one of those [[ColonyDrop who live there]], would be quite frequent.

The main problem with the AsteroidThicket trope in RealLife is, of course, [[SciFiWritersHaveNoSenseOfScale the sheer size of space]]. Even if the number of known asteroids is in the hundreds of thousands, down to those that have sizes comparable to that of a car, and if one includes even smaller bodies the numbers could very well be in the millions or more the space is so vast that if you were to cross the Solar System you'd be very lucky to find something larger than specks of space dust[[note]]The Sun aside, if you explored the sky with a telescope you could notice that some "stars" moved respect to the sky's background -planets or asteroids-. While your telescope could resolve the former into distinct bodies, the latter unless you had a ''really'' big one and/or were quite close would continue looking like stars[[/note]]. The [[https://en.wikipedia.org/wiki/Edgeworth–Kuiper_belt Kuiper belt]] and especially the [[https://en.wikipedia.org/wiki/Oort_cloud Oort cloud]] are thought to be far more massive than the inner asteroid belt, where most asteroids are confined, but there's ''a whole lot'' of space to fill and thus are even more sparse[[note]]The [[https://en.wikipedia.org/wiki/Jupiter_trojan trojan asteroids]], that precede and follow Jupiter in their orbit are thought to be packed more densely than asteroids on the main belt. However, they're still a far cry of fictional ones[[/note]].

Nonetheless, there's still ''some'' room to have a dense asteroid field. One belt where what has been stated above occurs in Saturn's rings, with rubble piles forming and being broken down later, happened, was massive, ''and'' orbited very close to a star (preferably a small one as a [[https://en.wikipedia.org/wiki/White_dwarf white dwarf]], even better than a [[https://en.wikipedia.org/wiki/Red_dwarf red dwarf]]). However besides being ''very'' hot being so close to a star it would rather look like a planetary ring, but surrounding a star instead of a planet.

Nonetheless, there's still ''some'' room to have a dense asteroid field. One belt where what has been stated above occurs in Saturn's rings, with rubble piles forming and being broken down later, happened, was massive, ''and'' orbited very close to a star (preferably a small one as a [[https://en.wikipedia.org/wiki/White dwarf white dwarf]], even better than a [[https://en.wikipedia.org/wiki/Red dwarf red dwarf]]). However besides being ''very'' hot being so close to a star it would rather look like a planetary ring, but surrounding a star instead of a planet.

The main problem with the AsteroidThicket trope in RealLife is, of course, [[SciFiWritersHaveNoSenseOfScale the sheer size of space]]. Even if the number of known asteroids is in the hundreds of thousands, down to those that have sizes comparable to that of a car, and if one includes even smaller bodies the numbers could very well be in the millions or more the space is so vast that if you were to cross the Solar System you'd be very lucky to find something larger than specks of space dust[[note]]The Sun aside, if you explored the sky with a telescope you could notice that some "stars" moved respect to the sky's background -planets or asteroids-. While your telescope could resolve the former into distinct bodies, the latter unless you had a ''really'' big one and/or were quite close would continue looking like stars[[/note]]. The [[https://en.wikipedia.org/wiki/Edgeworth–Kuiper_belt Kuiper belt]] and especially the [[https://en.wikipedia.org/wiki/Oort_cloud Oort cloud]] are thought to be far more massive than the inner asteroid belt, where most asteroids are confined, but there's ''a whole lot'' of space to fill and thus are even more sparse.

Alas, as mentioned on the main page the rocks within a belt so dense would -in astronomical terms- soon begin to collide with themselves, smashing into dust[[note]]This is one the sources of the [[https://en.wikipedia.org/wiki/Zodiacal_glow Zodiacal light]], in our Solar System[[/note]] or [[FusionDance merging to eventually form a larger body]], as happened in the early days of the Solar System[[note]]It should be noted here that asteroid orbits are usually more or less eccentric and/or inclined, so close approaches and even collisions may happen. However approximations among asteroids where one sees the other as more than a bright star, short of collisions, are very rare in the comparatively sparse and clean Solar System of these days[[/note]].

In planetary ring systems, things are somewhat different since in one hand the gravity of the planets they surround [[https://en.wikipedia.org/wiki/Roche_limit stops them of coalescing to form a larger body]] and circularizes the orbits of the space debris that forms them, this without including the role of [[https://en.wikipedia.org/wiki/Shepherd_moon shepherd moons]], minimizing the collisions between the bodies that form them at least to a point[[note]]Even so, Saturn's rings are far from being static and are thought to be formed of aggregates of small boulders that are broken down by collisions, later merging again and so on[[/note]]

The main problem with the AsteroidThicket trope in RealLife is, of course, the sheer size of space. Even if the number of known asteroids is in the hundreds of thousands, down to those that have sizes comparable to that of a car, and if one includes even smaller bodies the numbers could very well be in the millions or more the space is so vast that if you were to cross the Solar System you'd be very lucky to find something larger than specks of space dust[[note]]The Sun aside, if you explored the sky with a telescope you could notice that some "stars" moved respect to the sky's background -planets or asteroids-. While your telescope could resolve the former into distinct bodies, the latter unless you had a ''really'' big one and/or were quite close would continue looking like stars[[/note]]. The [[https://en.wikipedia.org/wiki/Edgeworth–Kuiper_belt Kuiper belt]] and especially the [[https://en.wikipedia.org/wiki/Oort_cloud Oort cloud]] are thought to be far more massive than the inner asteroid belt, where most asteroids are confined, but there's ''a whole lot'' of more space to fill and thus are even more sparse.

Alas, as mentioned on the main page the rocks within a belt so dense would -in astronomical terms- soon begin to collide with themselves, smashing into dust[[note]]This is one the sources of the [[https://en.wikipedia.org/wiki/Zodiacal_glow Zodiacal light]], in our Solar System[[/note]] or [[FusionDance merging to eventually form a larger body]], as happened in the early days of the Solar System[[note]]It should be noted here that asteroid orbits are usually more or less eccentric and/or inclined, so close approaches and even collisions could happen. However approximations among asteroids where one sees the other as more than a bright star, short of collisions, are very rare in the comparatively sparse Solar System of these days[[/note]].

A rather unpleasant side effect of dense asteroid belts is that those collisions among large asteroids that break them producing [[AsteroidMonster lots of smaller ones]], that may end up being expelled from the belt into orbits that would carry them to bad places for both the health of those smaller asteroids as well as the one of those [[ColonyDrop who live there]], would be quite frequent.

A side effect of dense asteroid belts, is that collisions among large bodies produce lots of smaller ones, that may end up being expelled from the belt into orbits that would carry them to undesirable places for the health of those smaller asteroids, and whose inhabitants tend to dislike when [[ColonyDrop big rocks fall from the sky]].

The main problem with the AsteroidThicket trope in RealLife is, of course, the sheer size of space. Even if the number of known asteroids is in the hundreds of thousands, down to those that have sizes comparable to that of a car, and if one includes even smaller bodies the numbers could very well be in the millions or more the space is so vast that if you were to cross the Solar System you'd be very lucky to find something larger than specks of space dust[[note]]The Sun aside, if you explored the sky with a telescope you could notice that some "stars" moved respect to the sky's background -planets or asteroids-. While your telescope could resolve the former into distinct bodies, the latter unless you had a ''really'' big one and/or were quite close would continue looking like stars[[/note]]. The [[https://en.wikipedia.org/wiki/Edgeworth–Kuiper_belt Kuiper belt]] and especially the [[https://en.wikipedia.org/wiki/Oort_cloud Oort cloud]] are thought to be far more massive than the inner asteroid belt, where most asteroids are confined, but there's ''a whole lot'' of more space to fill and are even more sparse.

A planetary system in formation would be closer to this trope, at least while it lasted (see next paragraph). However it would probably look like more as "lots of stars more or less bright depending of closeness and size moving in front of the background, real, stars and some large bodies that, when close, would appear with some luck when using a telescope or (much rarely) to the naked eye as more than just points of light", instead of rock fragments as far as the eye can see as a big planetary ring.

Alas, as mentioned on the main page the rocks within a belt so dense would -in astronomical terms- soon begin to collide with themselves, smashing into dust[[note]]This is one the sources of the [[https://en.wikipedia.org/wiki/Zodiacal_glow Zodiacal light]], in our Solar System[[/note]] or [[FusionDance merging to eventually form a larger body]], as happened in the early days of the Solar System.

The main problem with the AsteroidThicket trope is, of course, the sheer size of space. Even if the number of known asteroids is in the hundreds of thousands, down to those that have sizes comparable to that of a car, and if one includes even smaller bodies the numbers could very well be in the millions or more the space is so vast that if you were to cross the Solar System you'd be very lucky to find something larger than specks of space dust[[note]]The Sun aside, if you explored the sky with a telescope you could notice that some "stars" moved respect to the sky's background -planets or asteroids-. While your telescope could resolve the former into distinct bodies, the latter unless you had a ''really'' big one and/or were quite close would continue looking like stars[[/note]]. The [[https://en.wikipedia.org/wiki/Edgeworth–Kuiper_belt Kuiper belt]] and especially the [[https://en.wikipedia.org/wiki/Oort_cloud]] are thought to be far more massive than the inner asteroid belt, where most asteroids are confined, but there's ''a whole lot'' of more space to fill and are even more sparse.

A side effect of {{AsteroidThicket}}s, is that collisions among large bodies produce lots of smaller ones, that may end up being expelled from the belt into orbits that would carry them to undesirable places for the health of those smaller asteroids, and whose inhabitants tend to dislike when [[ColonyDrop big rocks fall from the sky]].