Earth's climate has swung between ice ages and warmer periods for millions of years, driven by subtle changes in our planet's orbit and axial tilt. These variations, known as Milankovitch cycles, ...
A super-Earth on a highly eccentric orbit would also be especially bad news for the inner planets, because it would be more likely to push or pull Earth, Mars and Venus into eccentric or tilted orbits ...
A newly identified planet candidate, HD 137010 b, looks strikingly Earth-like in size and orbit — but it may be colder than Mars due to its dimmer star. If it has a thick enough atmosphere, though, ...
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