Want this question answered?
other ones! how old are you? if your at least 7, you should know. there are also other planets.
There are many bright objects beyond the?ægalaxies including stars and other planets. There could be things people?ædon't know about as well.
The planets we know of, some 300 now, are all in the Milky Way galaxy.
All of the ones we know about and have named are in our Galaxy.
All the planets we know of... even those orbiting other stars... are in the Milky Way Galaxy.
Probably not; we only know of a couple dozen planets or so total, yet the galaxy must have billions if not trillions of planets in it.
Scientist know this by the color difference on the planets surface.
i don't know! ask a scientist.
We know because astronaughts have gone to space and exploured around space and found out many more plantets beyond pluto.
No one has ever seen a black hole; so how do we know of them? Well, scientist's measured to movements of planets and saw them all moving toward a force. Now, we believe that there is something in the center of the galaxy that is pulling planets and stars towards it. Scientist's measured that this force is strong enough to decease anything that comes in contact with it. We call this force a "Black Hole". Why is it called a BLACK hole? Well, it is so strong that not even light can escape it.
Who knows. Probably billions of billions, but we will never know the total amount.
Impossible to know because we don't know EVERY galaxy. The portion of the universe that we have to ability to see is extremely small compared to the entire universe.