A moon is generally understood to be an object that orbits a planet (although what counts as a planet is itself a contentious ...

Astronomers are investigating a potential hidden planet, dubbed Planet Y, far beyond Neptune. Its gravitational pull is suspected to be causing unusua ...

Recently, astronomers detected the presence of a relatively new quasi-moon called 2025 PN7, which appears to orbit our planet ...

Our solar system now, once again, officially consists of only eight planets. Although largely debunked, speculation continued ...

It will be a while before you can see it for yourself, however. Halley’s comet was last visible from Earth in 1986, meaning ...

Related: Scientists Discover New Dwarf Planet in Solar System, Far Beyond Pluto It's actually incredibly difficult to see what lies beyond the orbit of Neptune. So far from the Sun, the small objects ...

The James Webb Space Telescope spacecraft is located 5 degrees below the Pleiades star. As the month wears on, it travels ...

Have you ever wondered how long it takes for each planet to orbit the Sun? From Mercury’s blazing 88-day year to Neptune’s astonishing 165-year journey, every planet moves at a completely different ...

Mercury will trine Saturn on Oct. 25, presenting the opportunity to open up in ways you haven't before. Here's what the ...

Over the past seven decades, thousands of sophisticated spacecraft have been launched on ambitious missions to look down on ...

From the column: "Just 0.3% of the world’s land area would need to be covered with solar panels to meet all energy needs." ...

Planet Y is the latest in a series of hypothetical solar system planets that scientists have proposed in recent years, all with slightly different characteristics, but collectively believed to be ...