The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

But how does gravity work in the first place ... This tendency allows the formation of stars, planets, galaxies, and black ...

The formation of our solar system from a singular nebula raises an intriguing question: why did each planet develop with a ...

"With an orbital period of 570 days, it is a relatively cold gas giant planet," said Guðmundur Stefánsson of the University ...

Gravity is greater closer to the star ... and these materials combined together to form the inner planets. The outer four planets (Jupiter, Saturn, Uranus, and Neptune) are called gas giants.

which slowly accretes to form systems of planets. For the past decade, astronomers have relied on the Atacama Large Millimeter/submillimeter Array (ALMA) in Chile to study young stars and their ...

Gravity then caused dust and gas to be continually tugged ... Gregory says, 'The asteroids are rocky debris left over from the era of planet formation, 4.5 billion years ago. 'They are very valuable ...

James Webb Space Telescope captures HH 30’s disc, revealing dust movement, jets, and planetary formation processes.

Scientists believe that two asteroids might be fragments of long-lost "planetary embryos" from the early solar system.

There is not enough gas and dust for these giant planets to form where they are observed, so the accepted theory is that they originate far from their star and migrate inward as the planetary ...

Stargazers will be treated to a dazzling six- and seven-planet "alignments" in February. A planetary alignment, or a "planet ...

Through gravity, the planetesimals attract further ... and particle growth and thus help to understand the details of planet formation.