Expert Voices

"What is cosmic microwave background radiation? Did it happen after the Big Bang?" – Sreehari, aged nine, Kerala State, India

If a distant solar system is millions of light years away and so we see it as it was millions of years ago, how can we see what it looks like now? Parul, aged 13, Sri Ganganagar, India

Nocturnal behaviors have been evolved to take advantage of the darkness of night. Yet today, they are under an increasing threat from the presence of artificial lighting.

As the space industry grows, it's safe to say incidents of space debris hurtling back to Earth will only become more frequent – and they could pose a risk. But how much of a risk, exactly?

If you close your eyes and imagine a system of planets orbiting a distant star, what do you see?

But could these giant, rocky planets actually sustain the conditions for life? Or is life limited to smaller planets like our own?

Why are these meteors burning green, and what does it have to do with the aurora?

Galaxy clusters allow us to study a broad range of rich processes — including magnetism and plasma physics — in environments we can't recreate in our labs.

A new hypothesis proposes that a large fraction of dark matter may be bound up inside tight balls the size of Neptune — so-called dark matter planets.

Russia is building a new ground-based laser facility for interfering with satellites orbiting overhead, according to a recent report. Here's what that means.

Russia's announcement, while not a breach of any agreement or an immediate threat to the station's daily operation, does mark the culmination of months of political tensions involving the ISS.

We have also seen headlines claiming Webb has found “the oldest galaxies we have ever seen”, but what does that mean?

The ORGAN Experiment, Australia's first major dark matter detector, recently completed a search for a hypothetical particle called an axion in an attempt to try to explain dark matter.

This weekend might have three meteor showers active at the same time, combining to provide a celestial firework display almost all through the night.

It has been an exciting week with the release of breathtaking photos of our universe by the James Webb Space Telescope (JWST).

In the excitement of the observatory's first images, it's easy to forget that the James Webb Space Telescope has been the subject of controversy.

Fifty years ago, U.S. scientists launched a satellite that dramatically changed how we see the world.

Scientists who study exoplanets explain how the James Webb Space Telescope will study exoplanet atmospheres.

We honor the heroes of Apollo 11 and all those who made their accomplishment possible, yet many still deride astronauts in the U.S. private space industry.

One argument in favor of space exploration highlights benefits that help study, monitor and address serious concerns on Earth, like climate change and food production.