Latest about expert voices
Inside 'Earthrise': A historian's take on the origins of the Apollo 8 'image of the century'
The impact of Apollo 8's "Earthrise" picture – the sight of the Earth from the moon – now seems even greater than that of the first landing.
Space rocks and asteroid dust are pricey, but these aren’t the most expensive materials used in science
I use moon and Mars rocks in my teaching and have a modest collection of meteorites. I marvel at the fact that I can hold in my hand something that is billions of years old from billions of miles away.
Astronomers have learned lots about the universe − but how do they study astronomical objects too distant to visit?
What astronomers can measure using telescopes is not what we really want to know – instead, we calculate the properties we're interested in studying by observing and interpreting apparent properties from afar.
Why Einstein must be wrong: In search of the theory of gravity
Unlike physical theories describing the other three fundamental forces in physics, the general theory of relativity has only been tested in weak gravity.
How do astronomers know the age of the planets and stars?
Measuring the ages of planets and stars helps scientists understand when they formed and how they change – and, in the case of planets, if life has had time to have evolved on them.
The Space Force should safeguard US interests on the moon (op-ed)
While the Pentagon sees the Space Force as a tool to fight the last war here on Earth, its leaders must prepare for its real role in space, on the moon and beyond.
Heating and cooling space habitats isn’t easy – one engineering team is developing a lighter, more efficient solution
It’s hard to keep a spacecraft cool, but ongoing research on the International Space Station might yield a solution.
Spending time in space can harm the human body — but scientists are working to mitigate these risks before sending people to Mars
With NASA planning more missions to space in the future, scientists are studying how to mitigate health hazards that come with space flight.
