SpaceX and other companies are rushing to put thousands of small, inexpensive satellites in orbit, but pressure to keep costs low and a lack of regulation leave those satellites vulnerable to hackers.
Atmospheres can be all different colours, depending on what's in them.
An expert explains the challenges of a mission to Mars for younger readers.
Why isn't there an endless variety of planets in the universe? An astrophysicist explains why planets only come in two flavors.
The Dish in Parkes is scanning the southern Milky Way, searching for alien signals.
The Conversation50,7 MB (download)
Today we hear about the Parkes radio telescope's role in the search for alien life. Our guide is the irrepressible John Sarkissian, the scientist who's had his eye on The Dish since childhood.
The Babylonians' calendar was passed down from civilization to civilization.
NASA scientists have discovered a new planet orbiting around a nearby star that is in a habitable zone. But does this planet have liquid oceans that can support life?
Scientists can't expect the unexpected if they're not open-minded about how their theories might be wrong.
Sometimes it is difficult to take a photograph of an exoplanet because the star illuminating it is too bright. Now there is a new 'deluminator' telescope that can block out the extra light.
Many people are still upset that Pluto was demoted from being a planet. But definitions of various celestial objects are fairly fluid. So whether it is an asteroid or moon or planet is up for debate.
There is a massive black hole in the center of the Milky Way galaxy. Measurements of star orbits near this black hole suggest that there may be a second companion black hole nearby.
Young readers ask: How did our moon get its name?
Little bits of Jupiter's Great Red Spot seem to be flaking off. Is it a sign of the demise of this enigmatic red cloud, or just a consequence of atmospheric chaos we can't see from above?
India may soon follow in the footsteps of Asian space giants China and India, after the National Institute of Aeronautics and Space (LAPAN) announced a plan to build a spaceport in Papua.
Somewhere out there, just maybe, an alien – probably stranger looking than in our wildest imagination – might be pondering this very question.
There's really no reason you can't use binoculars to look into space – and in fact astronomers have been working on doing so for a long time.
Apollo 11 tends to steal the spotlight when it comes to lunar landings. But Apollo 12 was the first mission to make a precise pinpoint landing on the Moon - and without the aid of computers or GPS.
Dark sky sites can inspire new generations of stargazers, but a better long-term solution would be connecting people with the night sky where they live.
Beyond the outer edge of the Solar System, mysterious, unknown worlds await by the thousands. Astronomers can now finally find them and explore them - but will we find another Earth?
Although it has yet to fly any paying passengers and is currently loss making, Virgin Galactic aims to be profitable by 2021.