No two clocks in the universe appear to tick at exactly the same rate. That’s because no two clocks move at exactly the same speed, or feel exactly the same gravitational pull. Even two clocks o

ASTRONAUTS: There’s a chunk there that we can get. That’s a big fragment within this crystalline rock. Take a picture of that…Apollo 17 astronauts Gene Cernan and Jack Schmitt were

The earliest galaxies were a lot busier than their modern-day counterparts. They were giving birth to stars at a much faster rate. That included many stars that were especially hot and heavy. Those st

The most-distant objects we can see are galaxies more than 13 billion light-years away. That means we see them as they looked just a few hundred million years after the Big Bang. We know their distanc

During its four years of life, the InSight lander recorded more than 1300 “marsquakes.” Most of them were tiny, and most were caused by space rocks slamming into Mars. But the largest quak

During its four years of life, the InSight lander recorded more than 1300 “marsquakes.” Most of them were tiny, and most were caused by space rocks slamming into Mars. But the largest quake it ever felt came from the planet’s insides, far below the surfac

Olympus Mons is the Mauna Loa of Mars. Like the mountain on the island of Hawaii, its the largest volcano on its planet in this case, Mars. Also like Mauna Loa, it built up as molten rock bubbled through a hotspot in the crust. Finally, Olympus Mons m

Olympus Mons is the Mauna Loa of Mars. Like the mountain on the island of Hawaii, it’s the largest volcano on its planet —in this case, Mars. Also like Mauna Loa, it built up as molten roc

El Gordo – the fat one – might not be the most flattering name for a galaxy cluster. But it’s certainly accurate. El Gordo is the most massive cluster yet seen that’s so far aw

El Gordo the fat one might not be the most flattering name for a galaxy cluster. But its certainly accurate. El Gordo is the most massive cluster yet seen thats so far away more than seven billion light-years.The cluster is actually two clusters