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21st April 2009 - Gliese 581 e is only 1.9 times the size of Earth [See related link]

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Have they discover a new earth?

They have discovered some hundred planets outside our Solar System. Whether some of them are similar enough to our planet to be called "an earth", is open to debate.They have discovered some hundred planets outside our Solar System. Whether some of them are similar enough to our planet to be called "an earth", is open to debate.They have discovered some hundred planets outside our Solar System. Whether some of them are similar enough to our planet to be called "an earth", is open to debate.They have discovered some hundred planets outside our Solar System. Whether some of them are similar enough to our planet to be called "an earth", is open to debate.


What was the first planet discovered besides earth?

The first planet discovered besides Earth is Uranus. It was discovered by William Herschel in 1781.


When was Earth the planet discovered?

The earth as planet was discovered by some of the ancient astronomers. Nicolaus Copernicus and Ptolemy are credited with provision of the initial information of the earth as a planet in relation to the solar system.


Where was lettering discovered?

on planet earth


Is Thea Earth's twin?

was..then it smashed into earth and created the moon was..then it smashed into earth and created the moon


What planet was discovered in the 20th cenury?

earth


First planet tobe discovered?

Earth...


When was the new planet similar to earth found?

It was actualy not too long ago. Scientists discovered it Wednesday morning, December 7th 2011.


To which planet the earth is similar?

Venus is often compared as Earth's "sister planet", being similar in size and internal composition.


What planet is similar to Earth?

Mars


Which planet or moon haves enough density to support a the weight of a colony?

The planet that has enough density to support the weight of a colony is Mars. Scientists have discovered that Mars is relatively similar to the conditions on Earth.


Does earth really have a sister panet?

There is currently no confirmed sister planet to Earth. However, astronomers have discovered many exoplanets in other solar systems that share similar characteristics with Earth, such as being rocky and located in the habitable zone of their star.