What's the planet that used to be there but blown up?

Answer 1

This was an early hypothesis of the formation of the asteroid belt, which has now fallen into disfavor. See Wikipedia for the more widely accepted theory (called the accretion model) at this link:

http://en.wikipedia.org/wiki/Asteroid_belt

Anyway, the planet you are taking about is called "Phaeton". More info can be found at this link:

http://en.wikipedia.org/wiki/Phaeton_%28planet%29

This is interesting stuff.

Answer 2

In the early 20th century, there was a hypothetical planet called "Planet X". John Couch Adams and Urbain Le Verrier discovered Neptune in 1843 because of variances between the observed and calculated orbits of Saturn, Jupiter, and Uranus. The variances could only be explained by the gravitational influence of an undiscovered planet. After Neptune was discovered and observed, it was found that its gravity wasn't strong enough to account for the orbital variances of the three planets mentioned above. In the early 1900's, Percival Lowell hypothesized that there was yet another planet beyond Neptune, and named it Planet X. Even though it never existed, the search for it resulted in the discovery of Pluto and Eris.

Answer 3

Earth. now officially known as the 'George Bush Memorial Dust Cloud' .

Answer 4

i don't know of any planets but i do know of a couple of stars