How big can they get? What's the largest so far detected? Where does an 18 billion solar mass black hole hide? We've never seen them directly, yet we know they are there. Lurking within dense star clusters or wandering the dust lanes of the galaxy. Where they prey on stars. Or swallow planets whole....

A European space telescope blasted off Saturday on a quest to explore the mysterious and invisible realm known as the dark universe.

SpaceX launched the European Space Agency’s Euclid observatory toward its ultimate destination 1.5 million kilometers away, the Webb Space Telescope’s neighborhood.

Sentinel is a space-based infrared (IR) survey mission to discover and catalog 90 percent of the asteroids larger than 140 meters in Earth’s region of the solar system. The mission should also discover a significant number of smaller asteroids down to a diameter of 30 meters. Sentinel will be launch

On Monday, scientists announced the first-ever observation of a cosmic event using both gravitational wave detectors and conventional telescopes. They witnessed a kilonova, a violent, brilliant explosion that occurs when two neutron stars collide. The discovery was a massive undertaking. Thousands o...

Have you ever wondered why some telescopes are launched into space while others are built on remote mountain tops? What is actually the best for astronomy? Here we provide a ringside view of the fight for the elusive photons from deep space - is it a battle of the telescope giants?

According to ancient astronaut theorists, Ramanujan, the mathematician who lived almost a hundred years ago and whose breakthroughs helped form the basis of superstring theory and multidimensional physics, claimed to have been influenced by otherworldly beings in this clip from Season 11, Episode 5,...

fter a decades-long quest, The MIT-Caltech collaboration LIGO Laboratories has detected gravitational waves, opening a new era in our exploration of the universe.

Gravitational Waves Detected, Confirming Einstein's Theory: A team of scientists announced on Thursday, February 11, 2015 that they had heard and recorded the sound of two black holes colliding a billion light-years away, a fleeting chirp that fulfilled the last prediction of Einstein's general theo...

Watch live coverage as 'Star Trek' actor William Shatner goes to the edge of space on a private Blue Origin flight. If successful, Shatner, who is 90 years old, will be the oldest person to reach space.

This video zooms into the core of a rich star-birth region called the Lagoon Nebula, located in the constellation Sagittarius in the direction of our Milky Way galaxy’s central bulge.