The Search For Earth-Like Planets
The search for Earth-like planets is reaching a fever-pitch. Does the evidence so far help shed light on the ancient question: Is the galaxy filled with life, or is Earth just a beautiful, lonely aberration?
Supermassive Black Hole in the Milky Way Galaxy
From a distance, our galaxy would look a flat spiral, some 100,000 light years across, with pockets of gas, clouds of dust, and about 400 billion stars rotating around the galaxys center.
The Incredible Journey of Apollo 12
It's the ultimate buddy movie. Forty years ago, on November 19, 1969, astronauts Pete Conrad and Alan Bean landed on the moon in one of the most important of the Apollo flights.
When Will Time End?
Time is flying by on this busy, crowded planet as life changes and evolves from second to second. And yet the arc of human lifespan is getting longer: 65 years is the global average way up from just 20 in the Stone Age. Modern science, however, provides a humbling perspective.
How Large is the Universe?
The universe has long captivated us with its immense scales of distance and time. How far does it stretch? Where does it end and what lies beyond its star fields and streams of galaxies extending as far as telescopes can see?
The Largest Black Holes in the Universe
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.
Saturn's Mysterious Moons
Some 900 million miles from the Sun in the outer regions of our Solar System orbiting the planet Saturnlies a mysterious world.
Why some tropical storms erupt into monster hurricanes capable of wrecking coastlines. Can they be predicted?
Crashing into the Moon
Half a dozen countries are launching missions to the Moon to pave the way for a permanent human presence.