This marks the first time astronomers have observed the formation of a ring system. Saturn isn't the only planet in our solar ...

The interstellar object 3I/ATLAS has gathered significant scientific attention, and soon it will reach its closest point to ...

Harvard researcher Avi Loeb says comet 3I/ATLAS weighs 33 billion tons and spans 3.1 miles, making it far larger than ...

A new study suggests yet another theory for a possible extra planet in our solar system, likely of a size between Mercury and ...

The James Webb Telescope captures the beginning of planetary formation around the young star HOPS-315 for the first time.

There are a couple of ways that scientists can date planets, so which planets formed first in our solar system?

A newly tracked interstellar comet, which has been dubbed 3I/ATLAS and is likely to pass the sun, Jupiter, Mars and Venus ...

The interstellar object hurtling toward the inner solar system, where Earth is located, is much larger than previously ...

From lava worlds to gas giants, NASA says the variety of these worlds is staggering—and that signs of a further 8,000 distant ...

Portal Space Systems says it has successfully tested its solar thermal propulsion system at operational temperatures inside a ...