venus and earth collide.?

Question

ok, so they smash together, don't know why, they just do.
they smash into a million bits of cosmic dust and gravity pulls the particles together into a new venearth that is twice the size of earth.
1. what would this do to its relationship with the sun.
2. what (if any) atmospehre would it have, and
3.what kind of weather would it have.
4.if you have ever heard of the canopy theory, would this be possible after this cataclysmic catastrophe. (but only after all the lawyers are dead and school gets closed).

Answer 1

Well now, the energy of the collision would propel much of the debris away at more than escape velocity, so there is no chance it would all collect again in a single new planet. But just supposing it did for some strange reason, then:

1. Not much. The masses of the two planets is FAR too small to have an important effect on the Sun or the solar system as a whole.
2. Probably none, because it would all diffuse into space before the chucks could collect into a new planet. Or maybe a poisonous one like Venus has now, since the atmosphere of Venus contains MUCH more mass that the atmosphere of Earth, any mixing of the two would be much more Venus like than Earth like.
3. Really bad. With a Venus like atmosphere, runaway global warming would boil away the oceans.
4. Never heard of it.

Answer 2

If your concern is whether hitting the ocean instead of land makes a difference, then Obviousman's answer is... obvious, man. Giving Earth a more circular orbit does not lead to a collision scenario. The two orbits are separated by a distance which, on average, is over 41 million km (almost 26 million miles). Even taking the eccentricity of the elliptical orbits into account, the closest they ever get is still over 37 million km. If the two planets were on the same orbit (let us say Earth's orbit) and going in opposite direction (Earth going 29.8 km/s one way, Venus going 29.8 km/s the other way), then the relative speed of the collision would be a little more than 59.6 km/s (there would be slighly more speed from last minute gravitational attraction than there would be braking from hitting the 16 km outer crust of Earth -- crushing 16 km would take a quarter of a second). By the time the collision has absorbed enough energy for the planets to slow down, each planet would be more than halfway through the other. But it would take a lot of energy to turn Venus around AND place it on Earth's orbit.

Answer 3

a collision of such size may result in what we observe with the asteroid belt between mars and jupiter, hence its very unlikely that this would ever happen, since orbits of earth and venus are stable since millions of years.

in case it would happen:
1. the orbit and rest of the solar system would be uneffected since the sun is the dominant mass.
2. atmoshere vanishes cause there is no more concentrated mass holding it to the ground with its gravity
3. no atmosphere no more weather
4. oO ... what has this to do with lawyers and schools ?
a crash of that size is unsurvivable, no more lawyers, no more schools and noone left who remembers

Answer 4

Im just going to answer #4 saying thats imposible unless the sun lost its gravitational pull

Answer 5

no need to worry my friend scientists have already thought and well hopefully there not wrong its very rare that this will ever happen the gravity is to strong for the planets to move out of orbit.

Answer 6

who knows, probably if the remains got close to the sun they'd form together, make a new planet.

Answer 7

that would not be possible at all because each planet has its own axis or line to rotate from the sun.