I was so curious about this earth-like planet, i’m so interested in this such thing. The new planet is about 3.6 times the mass of Earth. It will take years to arrive in such planet that is 14 million miles away from our own solar system. In the statement of the scientists, it will take 100 years to travel in that earth-like planet. It is also stated that this new planet has the same atmosphere like earth and it has the temperature level of 31c up to 12c.
The planet is one of six now known to orbit the star [that link goes to a PDF of the journal paper]. Apparently, all the planets have neat, circular orbits, so the system seems to be stable. This new planet takes 37 days to orbit the star once, and orbits at a distance about 1/6 the distance of the Earth from the Sun. As far as we know, it’s the fourth planet from its star.
The planets have all been found by the Doppler method: as they orbit the star, they tug on it. This causes a shift in the wavelength of emitted light from the star. The mass of the planet, its distance from the star, and the shape of the orbit all determine how the light shifts, which is how astronomers found those properties of the new planet.
OK, so that’s what we know. Now let me be clear here about stuff we can be fairly sure about.
If you’re too close to a star, it’s too hot to support liquid water. If you’re too far, it freezes. This defines a rough region from the star — the Goldilocks Zone, for obvious reasons — where liquid water can exist on the surface of a planet. This depends on the star, of course, but also on other factors like the planet’s atmosphere; Venus could have liquid water, but its super-thick atmosphere produces a runaway greenhouse effect which has heated it to 460° C (900° F). If Mars had a thick atmosphere, it might support liquid water! So the planet itself matters here too.
Gliese 581g, as the new planet is called, is in the zone where the temperature is just right. And with a mass of just three times that of the Earth, it’s unlikely to be a gas giant.
If you have comments or questions feel free to ask me.