They found some changes in obliquity—Mars "wobbled" a bit more, Simpson said—but overall, the inner solar system remained habitable. "If it's one or two Earth masses, which is still a pretty ...

HD 20794 D follows an elliptical orbit more elongated than any of the planets in our solar system. This means it moves from the outer edge of the habitable zone to the inner region during its 647 ...

The planet is located within the habitable zone at a moderate distance from its star, HD 20794, where liquid water could theoretically exist on its surface. Unlike planets in the solar system ...