we don't. We do not have the technology to answer these questions.
We do not know. Although we have detected planets in other solar systems, we do not know what colors they are.
Orbiting stars. We know of eight planets orbiting our Sun, and we know of over 300 planets orbiting other stars.
We don't know about any other other place, besides Earth, that harbors life. But many scientists think that there is life on other planets.
We know of eight (8) in our solar system, and we know of a few hundred other stars that have planets although we can't actually see the planets.
None that we know of.
Yes, only on the Earth. We don't know if the other planets have life
Because we can see the nearest planets through telescopes and for those much further away we can detect them by their effect on other planets and stars.
All the planets we know of... even those orbiting other stars... are in the Milky Way Galaxy.
Other than Earth, no planets have been confirmed to be habitable. We do know of planets in other star systems upon which liquid water could theoretically exist but we can't measure the composition of the planets atmospheres therefore we can't know for certain whether or not they are habitable.
I don't think there would be planets, but I know there are stars!
yes
Yep,There's Gliese 581 g. There are also dwarf planets.