Life is known for certain to exist on Earth. While there are potential signs of past life on Mars and potential for life elsewhere in the universe, Earth is the only confirmed location where life currently exists.
planet earth
Earth is the only planet in the solar system where life is known to exist. It has a unique combination of conditions, such as liquid water, a stable atmosphere, and a suitable temperature range, that support the diverse forms of life found on our planet.
It is not known for certain whether aliens, if they exist, require oxygen. Life as we know it on Earth relies on oxygen for respiration, but there may be forms of life in the universe that have evolved to utilize different elements or means for survival.
Currently, Earth is the only planet where carbon-based life forms are known to exist. However, the search for life, including carbon-based life forms, continues on other planets and moons within our solar system and beyond.
Currently it is not known. With current technology, we are not able to detect the presence of life on other planets even if it does exist. However, we now know that planets are relatively commonplace, which many scientists believe strongly suggests that life must exist elsewhere in the universe.
"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)
No life is known to exist there. It is too cold, too dry, and there is very little atmosphere.
planet earth
water
Liquid water.
Earth is the only planet in the solar system where life is known to exist. It has a unique combination of conditions, such as liquid water, a stable atmosphere, and a suitable temperature range, that support the diverse forms of life found on our planet.
In real life, no space aliens are known and proven to exist.
First, you have to have an open mind. It is narrow-minded to think that somewhere in the vast universe there isn't some form of sentient life. But then humans tend to be rather egotistical to think that we are the 'only' sentient beings in the universe. Scientifically speaking, as it is a science question, it is not "narrow minded" to say no life is known to exist, until life is proven to exist. That's what "known" and "proven" are. No one here has denied the possibility of life; it has simply been acknowledged that it is not yet proven. That's not "egotistical", it is simply admitting a lack of certain knowledge. All science stems from acknowledging there are facts not yet known.
No. Life cannot exist on a star; stars are far too hot to support life. There are no known planets in the Polaris system and the output from Polaris A is probably too variable for a stable environment.
Possibly. If one can use a type of energy hypothetically known as Energy Z, or is born of non-human orgins, Superpowers of certain kinds could exist.
living things would not exist as earth is the only known planet which has life.
No aliens are, in real life, known to exist, let alone attack.