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![The World Clock in Berlin shows global times and has a large structure of the solar system on top, it is surrounded by people and buildings.](https://cdn.mos.cms.futurecdn.net/aTgbC8orXRnTRnubawiUCm-320-80.jpg)
What is UTC?
By Adam Mann last updated
Reference Here's how time is coordinated around the world.
![a silvery-white spacecraft on the surface of the moon.](https://cdn.mos.cms.futurecdn.net/LEb2kLUkdpZay9QTj8srWS-320-80.png)
China returns samples from the moon's far side in historic 1st (video)
By Mike Wall published
China's Chang'e 6 mission has successfully returned samples from the moon's far side to Earth, notching another spaceflight first for the nation.
![a robotic lander stands on a barren grey surface against a black sky.](https://cdn.mos.cms.futurecdn.net/Hw8tqB7T9Y4E5ri2DpwtyV-320-80.jpg)
China's Chang'e 6 probe will soon bring samples of the moon's far side to Earth — and scientists are getting excited
By Rahul Rao published
China's Chang'e 6 probe is scheduled to return to Earth on June 25, and scientists are starting to get excited about what its far side moon samples can tell us.
![a view down layers of mechanical rings, decreasing in visual size to an open bottom showing a circle of red, martian surface.](https://cdn.mos.cms.futurecdn.net/k9a9DQt2gnBeq6ZK2xQ7Dk-320-80.jpg)
Air sealed in Perseverance's Mars sample return tubes is as precious as the rocks themselves
By Samantha Mathewson published
Scientists won't only study the rocks NASA's Perseverance rover has cached throughout its trek across Mars. They want the fresh Mars air, too.
![An artist's interpretation of what Planet Nine might look like.](https://cdn.mos.cms.futurecdn.net/ewHXX9BMeGHnMukE2jewPV-320-80.jpg)
How long would it take to reach Planet 9, if we ever find it?
By Harry Baker published
Some experts believe that the solar system's hypothetical ninth planet could be just a few years away from being discovered. If this is the case, how long would it take for humans to send probes to the elusive world?
![Artist's illustration of Planet Nine, a hypothetical world that some scientists think lurks undiscovered in the far outer solar system.](https://cdn.mos.cms.futurecdn.net/TEnAk4T6i9LspG45QJmWQY-320-80.jpg)
Planet Nine: Is the search for this elusive world nearly over?
By Harry Baker published
Astronomers have been scouring the outer solar system for signs of a hypothetical ninth planet for almost a decade, without success. However, we may finally be on the cusp of finding it, experts say.
![closeup of a mars rover's robotic arm investigating a patch of red planet ground](https://cdn.mos.cms.futurecdn.net/Hkzn4cEo33VTHTNbrZni5c-320-80.jpg)
Perseverance Mars rover digs into intriguing 'Bright Angel' rock formation (photo)
By Rahul Rao published
NASA's Perseverance rover has begun studying an intriguingly light-colored patch of rock that mission team members call "Bright Angel."
![View of the Mars horizon with parts of the Insight lander in the foreground](https://cdn.mos.cms.futurecdn.net/TD5hPB3mdCsYmyqGy3odLX-320-80.jpg)
Is there liquid water on Mars today? Marsquake data could tell us
By Rahul Rao published
Some scientists believe they may be able to find buried liquid water on the Red Planet by studying seismic and magnetic readings to reconstruct the aftermath of marsquakes.
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