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An illustration of a human head made of glowing dots facing right with glowing planets from our solar system at the back of its head all against a dark blue background

Does physics say that free will doesn't exist?

By Paul Sutter published

At first glance, it seems like our understanding of physics forbids free will.

Particle Physics

The best sci-fi Blu-rays to own: Beat the streaming subscriptions

By Fran Ruiz published

Looking to watch some of the best Sci-Fi movies and shows ever without having to rely on streaming? Don't skip these out-of-this-world Blu-ray editions.

Space Movies & Shows
An illustration showing two boxy satellites with solar panels floating in front of the red planet Mars

Lower-cost space missions like NASA's ESCAPADE are starting to deliver exciting science – but at a price in risk and trade‑offs

By Ari Koeppel published

This low-cost mission is still only getting started, and it's taking bigger risks than typical big-ticket NASA missions.

Missions
Ganymede images by NASA's Galileo spacecraft

On this day in space: Dec. 28, 2000: Galileo spacecraft sees auroras on Ganymede

By Hanneke Weitering, Chelsea Gohd last updated

On Dec. 28, 2000, NASA's Galileo spacecraft discovered auroras on Ganymede, Jupiter's largest moon.

Space Exploration
Four images next to each other with the top left being a black and white image of a satellite with green circles, the top right being a black and white image of a man in front of a red background, the bottom left showing cutouts of protestors on an orange background and the bottom right a deep space image showing a circled dot.

Our favorite Space.com stories of 2025

By Space.com Staff published

We asked our staff to choose their favorite Space.com stories of 2025. Here's what we got.

Space Exploration
A closeup of "leopard spots" on Mars seen by the Perseverance rover.

The top astronomical discoveries of 2025

By Keith Cooper published

Here are eight of the most spectacular astronomical discoveries of 2025.

Astronomy
Artist's illustration of space junk orbiting Earth.

Space debris: will it take a catastrophe for nations to take the issue seriously?

By Lesley Masters, Ian Whittaker published

When a piece of debris hits another object in space, it can also create more space debris, adding to the problem.

Space Exploration
Four images next to each other, from left to right an image of a green and brown Earthen landscape, a photo of president Trump wearing a red tie and black suit, a photo of a metal ball with wires coming out and a glowing blue light in a deep space image

The 12 biggest space stories of 2025 — according to you

By Monisha Ravisetti published

It's the 12 days of Spacemas, fa la la la la la la la la (sorry).

Space Exploration
A bright ball of light shoots red and purple and white sparks in front of a galaxy background with stars, purple, and blue colors on it

Dark matter may be made of pieces of giant, exotic objects — and astronomers think they know how to look for them

By Paul Sutter published

Searches for dark matter particles have come up empty so far, driving theorists to get more creative with their ideas.

Dark Universe
An illustration of concentrated dark matter at the heart of a spiral galaxy

Most normal matter in the universe isn't found in planets, stars or galaxies – an astronomer explains where it's distributed

By Chris Impey published

While space is often referred to as a vacuum, it isn't completely empty.

Astronomy
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