Expert Voices

For hundreds of millions of years, Earth’s climate has warmed and cooled with natural fluctuations in the level of carbon dioxide (CO₂) in the atmosphere.

What is it like to be on the surface of Mars or Venus? Or even further afield, such as on Pluto, or Saturn's moon Titan?

Just a few months ago, we were confidently expecting to launch our rover, Rosalind Franklin, to Mars in September as part of the ExoMars mission, a collaboration between Europe and Russia.

Both Voyager 1 and its twin, Voyager 2, carry little pieces of humanity in the form of their Golden Records.

A geologist explains what the "doorway" on Mars really is and why it's so tempting to see recognizable shapes on other worlds.

Setting up any kind of off-Earth mining industry will be no small feat. Let's look at what we're up against.

It sounds like the premise of a bad sci-fi movie: There's some mysterious entity, beyond the boundaries of our galaxy, that is pushing against us with incredible force.

Occasionally, Earth runs through a particularly narrow, dense clump of debris, resulting in a meteor storm.

Nations that don't have their own satellites rely on other countries, and those that want to develop their own satellite infrastructure are running out of options as space fills up.

Mars has almost no oxygen; it's only one-tenth of 1% of the air, not nearly enough for humans to survive.

Here's everything you need to know about our local supermassive black hole.

A racist usage of the Southern Cross contrasts with Indigenous narratives about the constellation, suggesting the symbol can never be contained within a single defining narrative.

The belief of the inevitability of space becoming the next major battlefield runs the risk of becoming a self-fulfilling prophecy.

What goes for moving clocks goes for everything else; physics, chemistry and biology all operate at a slower pace in moving frames of reference.

Particle physics has always proceeded in two ways, of which new particles is one. The other is by making very precise measurements that test the predictions of theories and look for deviations from what is expected.

Whether you need a new villain or an old Spider-Man, your sci-fi movie will sound more scientifically respectable if you use the word multiverse.

The inflationary epoch that caused our universe to rapidly expand in its earliest moments may be connected to the modern era of dark energy.

For over 70 years, astronomers have been scanning for radio or optical signals from other civilizations in the search for extraterrestrial intelligence, called SETI.

We can end the current fossil fuel war, by providing abundant resources and clean energy from the moon to Earth, and by moving our toxic industries away from our unique and precious biosphere.

Some scholars predict a future in which single states pursue various levels of dominance, while others foresee a scenario in which commercial entities bring nations together.