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.com invites experts in space exploration, science & technology to provide insightful commentary and informed perspective on news, current events, innovations, big ideas and ongoing research. Expert Voices includes Op-Ed analysis and opinion as well as interesting observations from the field and space exploration efforts around the world.
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.
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.
Unlike physical theories describing the other three fundamental forces in physics, the general theory of relativity has only been tested in weak gravity.
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.
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.
It’s hard to keep a spacecraft cool, but ongoing research on the International Space Station might yield a solution.
With NASA planning more missions to space in the future, scientists are studying how to mitigate health hazards that come with space flight.
The challenges of settling Mars stretch beyond the boundaries of rocket technology, impacting our biology and fundamentally questioning our identity as a species.
There's a slight chance Comet Nishimura might brighten unexpectedly. Astronomer Jonti Horner explains what to expect.
Caroline Herschel, the first English professional female astronomer, made contributions to astronomy that are still important to the field today.
Using the broad definition and adjusting for inflation, the relative size of the space economy fell by about one-fifth from 2012 to 2021.
Can what we learn about the metal asteroid Psyche with NASA's upcoming mission of the same name be extrapolated to solve some of the mysteries about the Earth's core?
Physicists like me don't fully understand what makes up "dark matter." Deep beneath South Dakota, we're trying to change that.
How humanity responds to the first contact with intelligent alien life could determine the very fate of our species. Here's what we can learn from history.
To find out what is beyond space, a good place to start would be to figure out where space – our universe – ends. The problem is we don't know where space ends, or even if it ends at all.
Over 100 different meteorite fragments collected by famed space rock hunter Geoffrey Notkin are currently up for bidding from Heritage Auctions.
The race is on. We are in a Sputnik moment — a sudden and important recognition that we are about to lose the heavens if we do not act with clarity and unity.
After a year without people, the sky would be bluer, the air clearer. The wind and the rain would scrub clean the surface of the Earth; all the smog and dust that humans make would be gone.