Latest about expert voices
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.
When SpaceX's Starship is ready to settle Mars, will we be? (op-ed)
The challenges of settling Mars stretch beyond the boundaries of rocket technology, impacting our biology and fundamentally questioning our identity as a species.
Are we about to see a rare green comet light up the sky? An expert explains what to expect from Comet Nishimura
There's a slight chance Comet Nishimura might brighten unexpectedly. Astronomer Jonti Horner explains what to expect.
