If you can't see a star, does it mean that there's something in front of it???

Answer 1

You mean like an Eclipse? It is when a star of planet moves in front of another star or planet. It hereby obstructs the view of the the star or planet behind it.

Answer 2

Well, technically everywhere we look we see a star- which begs the quesiton "If everywhere we look theres a star- why is the sky black?"

Good quesiton, and I don't know the answer to the paradox.

Just because we can't see something using visual light we can detect it using IR, UV or radio signals, or Xrays

Good Luck

Answer 3

good question. there are astronomically good reasons why the star you observed last night may not be viewable tonight.
it could be blocked by one of our planets in our system or one of theirs. it may not be viewable at the same time
every night. if it is a faint star it may not be viewable due to high cloud coverage. there are other reasons why a star you seen last night may not be visible tonight but it would take a class in physics to explain. just find another star, another galaxy too observe, your star may reappear.

Answer 4

Not necessarily. Some objects, you can't
see "unless there's something in front of it".
Wiki "Gravitational Lensing".

Answer 5

Either that, or it's too far away to be able to be seen because not enough of its light reaches the Earth.
.

Answer 6

Not necessarily; it may mean you forgot to remove the lense cap from your telescope.