Add Yahoo as a preferred source to see more of our stories on Google. Jupiter is already the biggest planet by far in our solar system, but new research suggests it was somehow once even larger than ...

See more of our trusted coverage when you search. Prefer Newsweek on Google to see more of our trusted coverage when you search. An asteroid 20 times larger than the one that may have wiped out the ...

Scientists have discovered a massive molecular cloud close to the solar system. As big as 40 full moons as seen from Earth, the vast structure — which poses no threat — is composed primarily of ...

Jupiter, the largest planet in the solar system, was 2 to 2.5 times bigger in its earlier life, according to new research. Credit: NASA / JPL-Caltech / SwRI / MSSS / Tanya Oleksuik Jupiter, the ...

Scientists have simulated what happens when a solar system pushes the limits of gravity and stability — and the results redefine what “possible” means. Past a certain scale, planets begin to drift, ...

Astronomers have found strong evidence of a giant gas planet orbiting a star in a solar system close to our own sun. Four light-years away from Earth, the Alpha Centauri triple-star system has long ...