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Recall, Mars captured its two small moons from the asteroid belt. It's likely that many of Jupiter's and Saturn's moons were also captured. However, most scientists seem to think that the four very large Galilean moons of Jupiter and possibly Saturn's very large moon, Titan, were in fact formed from left over planetary material of their host planets. This means the largest planets may have formed just like a small solar system of their own.
Link to More Asteroid Belt Facts
The vast majority of asteroids in the solar system are found in a region of the solar system out beyond Mars. They form the Asteroid Belt. Others orbit in near-Earth space and a few migrate or are thrown out to the outer solar system by gravitational interactions. The four largest asteroids in the belt are Ceres, Vesta, Pallas, and Hygiea. They contain half the mass of the entire belt. The rest of the mass is contained in countless smaller bodies. There was a theory once that if you combined all the asteroids they would make up the missing “Fifth” rocky planet. Planetary scientists estimate that if you could put all that material together that exists there today, it would make a tiny world smaller than Earth’s moon.
Wikipedia on planet collision theory
Theia orbited the Sun at around the orbit of Earth at the L4 or L5 Lagrangian points, but was perturbed by Jupiter and Venus into a collision with the early Earth. Theia struck Earth with a glancing blow[2] and ejected many pieces of both Earth and Theia. These pieces either formed one body that became the Moon, or formed two moons that eventually merged to form the Moon. Had Theia struck Earth head-on, it would have led to the destruction of both planets, creating a short-lived asteroid belt between the orbits of Venus and Mars.
originally posted by: CynConcepts
Why could there have not been a fifth and sixth planet? Is it not possible that if you increase the asteroid belt size with most of these moons, you may actually have 2 planets of considerable size that collided?
Actually, a portion of the original planet is still there. Its core. The remainder of the planet was disseminated throughout the solar system to land on other plants as meteorite impacts or left the solar system a very long time ago. I strongly suspect.
originally posted by: Essan
Actually, the largest asteroid, Ceres - which looks set to be re-designated as a planet (!) - is spherical.
Of course, once Ceres becomes a planet then the answer to the question is simple: was the asteroid belt once a planet? No, the planet is still there
originally posted by: CynConcepts
Another thought I have had what if early in our solar system, we actually had 2 suns? I
originally posted by: CynConcepts
a reply to: JadeStar
Thank you. I wasn't quick enough on my edit to you! How do we know it didn't have 2 suns collide and that is what created all the chaos in the beginning?
I love conciseness, but love to know where the facts come from. How was it determined that we have always been a single star system?
originally posted by: JadeStar
By careful examination of the planets and other bodies in our solar system.
Also had there been a 2nd star, even a widely separated binary companion would still be visible and gravitationally bound to our Sun. We see no such star travelling with our Sun as it makes its slow journey around the galaxy. Even a small low mass red dwarf or brown dwarf would have been detected in infrared surveys like WISE.
While searching for Earth-like planets, NASA’s Kepler spacecraft has come across 10 that share one very un-Earth-like quality: They orbit two stars, instead of one. The worlds are aptly named “circumbinary planets” (“circum” meaning around, and “binary” referring to two objects), and in this type of binary system, the two stars orbit each other while the planet orbits the two stars ...
...Now, astronomers have asked a new question: What would happen if a circumbinary planet were in the mix? Naturally, one assumes its inevitable, fiery demise. But findings, published online 9 July in the Proceedings of the National Academy of Sciences, reveal that may not be the case. Using a combination of theoretical and numerical formulas, astronomers calculated that the planet may actually be able to survive the blast. The difference between life and death depends on that third, distant body. The researchers mathematically showed that the same mechanism that forces the binary together shifts the alignment of the circumbinary planet, potentially allowing it to sneak far enough away to escape incineration. Even so, surviving without a home base is a bit of a lonely swap.
Bolding done by me for emphasis.
“When you see two stars colliding with each other, it depends on how fast they’re moving. If they’re moving at speeds like we see at the center of our galaxy, then the collision is extremely violent. If it’s a head-on collision, the stars get completely splashed to the far corners of the galaxy. If they’re merging at slower velocities than we see at our neck of the woods in our galaxy, then stars are more happy to merge with us and coalesce into one single, more massive object.”
What evidence, presently, would lead to your conclusion. And for the record are you stating this as fact, or theory...
The disc which formed our planets would have been disturbed in such a way that our planets orbits would even 4 billion+ years later show evidence of that.
originally posted by: CynConcepts
originally posted by: JadeStar
By careful examination of the planets and other bodies in our solar system.
Also had there been a 2nd star, even a widely separated binary companion would still be visible and gravitationally bound to our Sun. We see no such star travelling with our Sun as it makes its slow journey around the galaxy. Even a small low mass red dwarf or brown dwarf would have been detected in infrared surveys like WISE.
I am actually speculating more in regards to the Article I had linked to in earlier post..
While searching for Earth-like planets, NASA’s Kepler spacecraft has come across 10 that share one very un-Earth-like quality: They orbit two stars, instead of one. The worlds are aptly named “circumbinary planets” (“circum” meaning around, and “binary” referring to two objects), and in this type of binary system, the two stars orbit each other while the planet orbits the two stars ...
...Now, astronomers have asked a new question: What would happen if a circumbinary planet were in the mix? Naturally, one assumes its inevitable, fiery demise. But findings, published online 9 July in the Proceedings of the National Academy of Sciences, reveal that may not be the case. Using a combination of theoretical and numerical formulas, astronomers calculated that the planet may actually be able to survive the blast. The difference between life and death depends on that third, distant body. The researchers mathematically showed that the same mechanism that forces the binary together shifts the alignment of the circumbinary planet, potentially allowing it to sneak far enough away to escape incineration. Even so, surviving without a home base is a bit of a lonely swap.
Another Article link on Can stars collide.
Bolding done by me for emphasis.
“When you see two stars colliding with each other, it depends on how fast they’re moving. If they’re moving at speeds like we see at the center of our galaxy, then the collision is extremely violent. If it’s a head-on collision, the stars get completely splashed to the far corners of the galaxy. If they’re merging at slower velocities than we see at our neck of the woods in our galaxy, then stars are more happy to merge with us and coalesce into one single, more massive object.”
I am speculating on why it is possible that we had 2 suns in the beginning, not on whether we have 2 suns now.
These articles seems to make it a plausible assumption. There is a lot of info out there about speculating on 2 suns currently, just seems tough to find info on why we could not have had 2 suns that slowly collided in the beginning to create our 1 sun?
In keeping with the theme of the thread...such chaos could have created the asteroid belt by causing small planets to collide. Perhaps, explain why Mars formed and not the asteroid belt. 2 suns would have had a different gravitational pull on orbits but if they merged into one it would singularly localize it, right? .
originally posted by: pl3bscheese
a reply to: JadeStar
That game is fun! I got 2.1 million so far, think I might break 5mil
5.9M
9.7M
13.3M
whooops!
okay, i'm done