It used to be. Scientists have found frozen water on Mars.
No, except mars
Yes Mars has oxygen.
They all do. Every object in the universe has gravity.
Not entirely sure what you mean with "living planet"; there is no known life on Mercury, or on any other planet on our Solar System for that matter, except on Earth of course.
rashosho said because your mom
Eclipses of their moons can be observed on any planet that has them. But, interestingly, the spectacular "total solar" eclipses are not possible on any other planet but Earth.
As far as what we know today, there is no life on any planet anywhere, except the Earth.
If you are talking about planet Earth the answer is no. When the Sun burns out the Earth will be destroyed. ALso same with the other planets will be destroyed (except the outer planets), earth will dry up.
.How do you know that earth isn't the other planet?
EARTH,🧐🧐 but in future it may possible to live on other planet
Human have landed on the Moon, not a planet. It was NASA's Apollo missions which successfully landed humans on the Moon from 1969 to 1972. No human has landed on any other planet besides Earth's Moon.
Gravity exists on all planets, though the force differs depending on the mass of the planet.