Meteroids or comets can impact on a planet.
Another planet, a satellite, meteorites, asteroids or comets.
pluto
The impact hole left in the Earth or any planet would be a crater.
Impact crater is one term for the hole in the ground caused by a meteor hitting the planet.
A crater
There is no planet heading towards Earth. All the planets have well defined orbits. and will not impact each other in the foreseeable future.
The planet does not have a significant impact on earth.
An asteroid
pluto
Yes, anything in space can hit a planet if its strong enough to get past the atmosphere.
impact crater
human ecology
I think it is Mercury.
Mars
The impact hole left in the Earth or any planet would be a crater.
The impact hole left in the Earth or any planet would be a crater.
The impact hole left in the Earth or any planet would be a crater.
What do you mean by impact? The next big impact could be a Hunger Games movie sequel, or a meteorite that kills the whold planet.