The icy solar system comet C/2024 E1 (Wierzchos) is set to make its closest pass of Earth tomorrow (Feb. 17), an event known to astronomers as perigee. But your ability to see the ancient wanderer ...

A study published this week in Nature Communications posits that Earth's core holds a lot of hydrogen. The range is from nine to 45 oceans' worth of hydrogen, mostly locked up in the form of iron ...

Comet 3I/ATLAS is already racing back into deep space, but its surprise resurgence in December 2025 has turned a fading curiosity into a case that planetary scientists will be arguing over for years.

Comet Wierzchoś, also known as C/2024 E1, is rapidly brightening as it approaches its closest point to Earth next week. But ...

A newly found comet is well on its way toward the sun, set to reach its nearest point come spring. The comet, dubbed C/2026 A1, was discovered by a group of French scientists at a Chilean observatory ...

NASA's SPHEREx space telescope detected organic molecules coming off comet 3I/ATLAS as the interstellar visitor made its closest approach to Earth in December.

41P/Tuttle-Giacobini-Kresak is now known to be in the Jupiter family of comets, going from a little inside Jupiter's orbit to almost as far as Earth on its 5.4-year orbit. It is notable for its large ...

This newly discovered comet C/2026 A1 (MAPS), a rare Kreutz sungrazer, could blaze brightly in early April — or it could disintegrate entirely. Here's what to know.

The interstellar visitor, only the third such object to be discovered passing through our solar system, ignited controversial ...

The fate of a comet that was predicted to pass close to Earth remains a mystery five years after its dramatic breakup in the inner solar system.

As much as 45 oceans’ worth of hydrogen may be in Earth’s core, scientists reported, suggesting most of Earth’s water was ...

A newly discovered comet, C/2026 A1 (MAPS), has captured astronomers' attention with the potential for a spectacular cosmic display in early April. If it survives its close encounter with the Sun, it ...