A new study has proposed the existence of Planet Y, an alternative Planet Nine candidate that is smaller and closer to Earth ...

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

Using JWST and ALMA data, astronomers have spotted a superlong and narrow 'galactic contrail,' possibly produced by a black ...

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

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

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

Voyager 1 has been exploring the cosmos for decades, but when it reached the edge of the solar system, it found something ...

Astronomers found that interstellar object 3I/ATLAS shows an "extreme abundance ratio" of nickel and iron in its gas plume.

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

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