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The light from KIC 8462852 faded again, and scientists have some new theories about what's behind astronomy's most mysterious star.

This video is about why it's harder to successfully land spacecraft and landers and rovers on Mars than on Earth, or Venus, or the Moon, or Titan, or asteroids. It all comes down to atmospheric density! When there's no atmosphere, you can do a powered descent in a flimsy tinfoil spacecraft like the Lunar Module, and when there's plenty of atmosphere you can do an unpowered descent via heat shield and parachutes like the space shuttle, Apollo command module, Soyuz, Huygens, etc. But on Mars with its thin air, you have to do both powered & unpowered descent, getting the worst of both worlds.

The solstice alignments of Stonehenge, explained.

More than 18,300 candidates applied to be astronauts in NASA's latest class-smashing the record of 8,000 applicants in 1978-and only 12 got the job. Here's who made the cut.

Amazing images of the far reaches of the universe are everywhere, but are they accurate? What does space really look like?

In 2018, NASA will launch a solar probe that will travel closer to the sun than any spacecraft before. But why? What are they looking for?

Incredible before-and-after satellite images of our dynamic planet.

How did everything get started? Has the universe a beginning or was it here since forever? Well, evidence suggests that there was indeed a starting point to this universe we are part of right now. But how can this be? How can something come from nothing? And what about time? We don't have all the answers yet so let's talk about what we know.

Are you alone? To answer this question we have to take a look what "you" are first. What are you made of and where you stand in this universe. Are you your body? Your atoms? And how are your parts connected to the big picture?

Everyone is freaking out about the discovery of 7 new potentially-habitable exoplanets, but is Trappist-1 really as good as it sounds?

Large chemical rockets are needed to launch payloads into space from the ground, but could rockoons, rocket balloons, be a more efficient alternative?

Scientists think studying 'extremophiles' in toxic hydrothermal vents could teach us about potential extraterrestrial life.

Amazing before and after satellite images taken from the International Space Station show how quickly our dynamic, but fragile planet can change.

We've been searching for intelligent life in the universe for decades, but have we been doing it all wrong?

We are trapped on earth. Controlled by an ancient debt to the universe...

There are cosmic snipers firing at random into the unvierse. What are they and what happens if they hit us?

What exactly makes a journey to Mars so perilous? Is it okay to touch Martian dirt with your bare hands?