Through a phenomenon known as gravitational lensing, aliens could be transmitting signals using the sun, but a quick scan for such signals has turned up nothing.
Astronomers detected 400 previously unknown black holes in a new X-ray survey of dusty galactic centers.
A radar system less powerful than a household microwave oven produced some of the best pictures of the moon ever captured.
An astronomer proposes that the sun-like star 2MASS 19281982-2640123 is the origin of the Wow! Signal
Reference Jupiter is the largest planet in the solar system, with moons, rings and beautiful clouds.
Reference Uranus is a strange world in the solar system that spins on its side. A new probe that will visit Uranus in the coming decades could unlock even more secrets about this peculiar planet.
Reference Saturn is one of the most beautiful worlds in the solar system, with spectacular rings and moons that could host life.
Reference Venus is Earth's next-door neighbor and could be Earth's twin, if not for the sulfuric acid clouds and hellish surface temperatures.
Learn all about Earth, from how our planet formed to what it's made of to why life exists on our blue planet.
The Large Hadron Collider is the world's most powerful particle accelerator. Here's a look at the atom smasher and all its amazing discoveries.
Experts dismiss NASA's reasons for being secretive about wet dress rehearsal of its major moon rocket.
Reference Relativity is one of the most famous scientific theories of the 20th century, but how well does it explain the things we see in our daily lives?
Reference Electromagnetic radiation is a form of energy that includes radio waves, microwaves, X-rays and gamma rays, as well as visible light.
To celebrate Pi Day, we asked several mathematicians to tell us their favorite non-pi numbers. Here are some of their answers.
Reference Pi represents the ratio of the circumference of a circle to its diameter. Pi is an irrational number that never ends; the decimals go on forever and ever.
Reference Quantum mechanics is the body of scientific laws that describe the wacky behavior of photons, electrons and the other particles that make up the universe.
With one of the world's most precise atomic clocks, physicists have observed time dilation, confirming Einstein's theory of relativity.