Yes
Even if you don't believe that all of the millions of stars and billions of planets could have life:
We built and man the international space station!
Carbohydrates are related to life.
No, so far we have found no life in outer space. Life may well exist in outer space, but we haven't found it yet.
In real life, no space aliens are known and proven to exist.
For life to exist in space, it would need a source of energy, such as sunlight, to support metabolic processes. Water is essential for life as we know it, so the presence of liquid water or the building blocks of water, such as hydrogen and oxygen, would also be necessary. Additionally, a stable environment with suitable temperatures and protection from harmful radiation would be vital for sustaining life in space.
No. Cows exist only on Earth, not in space.
We have no way of predicting accurately where intelligent life can exist, we can only predict where human or earth-based life can exist. Life is a self-repeating chemical system, and it can potentially exist in any solar system, even on frozen moons that still have warm cores. Life that would be truly "alien" to us might even exist in the cold, seemingly dead space between stars, we can't know.
"Objects" generally doesn't refer to living things, but the only life in the universe that is currently known to exist is contained on Earth. (However, certain precursors of cellular life are likely to exist elsewhere, if not full life-forms)
If you mean human foreigners, yes. If you mean space aliens, none are *known* to actually exist, in real life. You have to exist to ingest, so at this time, the smart money is on "no".
It is because light can travel through space that Earth can get sunlight. Without sunlight life on Earth could not exist.
can life exist on mars
Yes, matter and space can exist in the same place. Matter occupies space, so they coexist within the same physical location. The presence of matter within a space gives that space substance and volume.
Liquids can exist in outer space, if they are in an enclosed area, such as a space craft, or a space station. They can not exist in a liquid state in unprotected outer space. Either they will freeze due to the extreme cold, or they will melt (or turn to gas) due to extreme heat.