I heard that there is a satlite of jupiter similar to planet like earth?

Answer 1

Not really "similar". The same gravitational forces that cause tides on Earth are at work on the four largest moons of Jupiter, but on much larger scales. Earth is small - our gravity only raises the tides a few feet. The Jovian moons are pulled and tugged bu the immense gravity of Jupiter, heating the cores to immense temperatures (kind of like bending a paperclip back in forth - before it breaks, it gets very hot).

The innermost satellite Io gets so hot its entire core is liquid magma. Io is constantly erupting, many hundreds of times a day. The next planet, Europa, is a frozen world on the outside. But because it is also heated internally, there is speculation that there is a massive liquid ocean under the ice, several miles thick. If true, that would mean there's more liquid water on Europa than there is on Earth. Liquid water is essential to life as we know it - and there are plenty of organic compounds and material out in space. Given water, heat, and organic compounds, there is the distinct possibility for life. But we won't know until we actually go there and drill into the topmost ice.

Ganymede is further out, and experiences less tidal force. Although there may be a liquid ocean under the ice there too, the ice is much thicker and it's estimated that the "ocean" may really be a mixture of icy sludge. The outermost moon, Callisto, is probably just a solid ice ball.

Answer 2

Jupiter has 60 some moons and still counting. The three biggest are ice but could resemble earth in it's early stages. In fact on Io there is volcanic activity. One day I believe we humans beings will live on these moons.

Answer 3

Well you may be thinking of Europa, which likely has a global ocean of water underneath its surface. This is interesting because water is believed to be a precursor to life.

Answer 4

Yes.