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Ever since people have started observing the sky, there has been the question of whether we are alone or not.
Frank Drake, the scientist who invented the Drake equation which is an equation to find the number of civilizations in our galaxy, estimates that there are 10,000 communicating civilizations in our galaxy alone.
Nasa estimated in 1999 that there were 125 billion galaxies in our universe.
Enceladus is one of Saturn’s moons and is thought to be able to support life. There is strong evidence supporting the theory that there is a large salt ocean below the surface, possibly supporting life.
Titan, Saturn’s largest moon, has lakes of liquid methane on the surface and a heavy atmosphere. This is the first body outside of Earth known to have surface liquids.
Pictures of Titan and Enceladus Picture showing Titan’s methane lakes Picture of the moon Enceladus
It is more than likely that there is life outside of our solar system that exists, but we haven’t discovered.
Scientists send out radio signals in space hoping to get a response from aliens, but this would be highly unlikely, because if another civilization was using radio technology now, by the time it gets there they might have moved on, or not even discovered it yet.
Scientists are looking in distant solar systems for planets that are a certain distance from the sun and have the right planetary conditions to support life.
On April 24, 2007 scientists discovered an extrasolar planet, a planet that’s not in our solar system, that orbits the right distance from it’s star to support life.
The planet was named Gliese 581 c, and was at first thought to have liquid on the surface. Recent research has found that there could be an atmosphere with lots of greenhouses that would cause high temperatures, lessening the chance of discovering life on the planet.
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