Certainly yes, it meteorite impact formed the same as sites on the other planets.
They believe the planets formed from a disc of gas and dust called a "protoplanetary disc".
Yes - no
The Wolfe Creek Crater in Australia is formed by a meteorite impact and consists mainly of sandstone rocks that were already present in the area before the impact. However, impact-related rocks such as breccia (a mixture of fragmented rocks) and impact melt rocks can also be found in and around the crater. These rocks contain evidence of the intense heat and pressure generated during the impact event.
They were made of dust, not rock
The planets in our solar system formed our of the solar nebular/disk from which the Sun was made (as the Sun formed), some 4,600 million years ago. Therefore there have always been roughly the same number of planets as we have now. However, our solar system could have lost one or more of the original planets that were formed as the planets settled into their current positions. As part of the settling process, orbital resonances can cause planets to interact with each other gravitationally and planets can be ejected from the forming solar system. If this did happen, then we do not how may planets there were originally.
They believe the planets formed from a disc of gas and dust called a "protoplanetary disc".
Meteorites hit other planets all the time. In fact, earth get hit the least (about twice every millenium).
No but the sizes of OTHER planets and planetesimals can and do.
The planets of our solar system were formed at different times, the earth is known to have formed as a planet about 4.6 billion years ago but other planets in the solar system may have formed earlier or later as they were quite conceivably not formed in the same manner as the earth
Yes - no
The other planets, stars, galaxies, meteors, comets, and asteroids.
gravity
The planets with more craters are the ones with less geologic activity. Geologic activity such as erosion, plate tectonics, and volcanic eruptions will wear down, bury, or otherwise destroy impact craters. If there is no geologic activity, then there is nothing to disturb the craters other than later impacts from comets and asteroids.
The gas planets are much more massive than the terrestrial planets and therefore have stronger gravity. It is believed that as they formed many of their moons formed around them much like the planets formed around the sun. Other moons are likely captured asteroids and comets.
The Wolfe Creek Crater in Australia is formed by a meteorite impact and consists mainly of sandstone rocks that were already present in the area before the impact. However, impact-related rocks such as breccia (a mixture of fragmented rocks) and impact melt rocks can also be found in and around the crater. These rocks contain evidence of the intense heat and pressure generated during the impact event.
All the planets of our solar system are believed to have formed at about the same period in time.
They were made of dust, not rock