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Scientists Find Strong Evidence That the Earth Was Hit Head-On by a Mars-Sized Planet

A new analysis of lunar rock and soil samples suggests that the Earth got full-on clobbered by an ancient planet called Theia.<p>The early solar system was, for lack of a better term, a chaotic hellscape. Everything we see today, from Mercury on out to the inner Oort Cloud, was a product of a series …

Relativity's Legacy: Your Guide to Traveling the Galaxy in Only 20 Years

<i>Paul Sutter is a research fellow at the Astronomical Observatory of Trieste and visiting scholar at the Ohio State University's Center for Cosmology</i> …

Jupiter's Moon Ganymede

In 1610, Galileo Galilei looked up at the night sky through a telescope of his own design. Spotting Jupiter, he noted the presence of several …

Nasa releases new photos of Pluto that 'make you feel you are there'

The pictures, gathered by the New Horizons spacecraft that swept past the dwarf planet in July, shed new light on Pluto’s mountains, glaciers and plains<p>The newest pictures of Pluto are so up-close and personal that the mission’s top scientist says it “makes you feel you are there”.<p>Nasa released the …

Solar System

Scientists found something unexpected in this eerie new image of Pluto

New Horizons, a spacecraft that flew by Pluto in July 2015, continues to stream photos back to Earth from billions of miles away — and each set is more incredible than the last.<p>The following images, released by NASA on Thursday, did not disappoint.<p>Fifteen minutes after New Horizons made its closest …

Solar System

Here's what it would look like to fly by Earth at the speed NASA flew by Pluto

NASA made history in July when its New Horizons spacecraft swooped by Pluto, giving humans a close-up look at this previously unexplored world.<p>The …

Solar System

What is Dark Matter?

Roughly 80 percent of the mass of the universe is made up of material that scientists cannot directly observe. Known as dark matter, this bizarre …

The first step toward finding gravitational waves in space will be launched this year

The LISA pathfinder will soon begin a six-month technology demonstration<p>Scientists are one step closer to detecting gravitational waves — ripples in the fabric of spacetime predicted by Albert Einstein in 1915. The LISA Pathfinder, the European spacecraft that houses the technology needed to detect …

Gravitational Waves

Pluto Photo Tsunami Coming Soon

Close ups of Pluto, its largest moon Charon and two of its tiny moons, Nix and Hydra. After a post-flyby break for the New Horizons spacecraft, …

Solar System

Space.com Celebrates Its 15th Anniversary

30 years after Neil Armstrong first set foot on the Moon, former CNN anchor Lou Dobbs surprised a lot of people by jumping into the dot-com boom by founding an ad-supported news site called, simply enough, Space.com. He surprised people further by leaving CNN to become the CEO of the nascent …

How to Write a 'Big Book'

Lots of writers dream of writing a big book.<p>A book that gets advertised and reviewed everywhere. A book that people are reading on trains, planes, and listening to in their cars on cross country trips or morning commutes.<p>A book that everyone sees at airport book racks. A book that makes all the …

Watch: The Fermi Paradox Explained in 6 Minutes

Where are all the aliens, anyway?<p>We live in a galaxy that's home to billions of stars and billions of habitable planets, which would seem to offer life the chance to spring up around the Milky Way. But if there are advanced alien civilizations out there, then where the hell is everybody and why …

The theory of parallel universes is not just maths – it is science that can be tested

The existence of parallel universes may seem like something cooked up by science fiction writers, with little relevance to modern theoretical …

Quantum Mechanics

Four future space technologies that will change the world in your lifetime

From ending natural disasters, to flying to Sydney in an hour, scientists are working on future technologies to solve some of humanity's biggest challenges<p>Imagine a world where severe storms, tornadoes, and flash flooding are no longer a threat to human life. Or a time when flying from London to …

Not Just Another Discussion About Whether AI Is Going To Destroy Us

An AI roundtable discussion is a staple of the tech journalism circus — usually framed with a preamble about dystopic threats to human existence from the inexorable rise of ‘super intelligence machines’. Just add a movie still from <i>The Terminator</i>.<p>What typically results from such a set-up is a …

Artificial Intelligence

FYI: Can Anything Move Faster Than Light?

Yes, the universe itself will eventually outpace the speed of light. Just how this will happen is a bit complicated, so let's begin at the very beginning: the big bang. Around 14 billion years ago, all matter in the universe was thrown in every direction. That first explosion is still pushing …

Why The Black Hole Information Paradox Is Such A Problem

You might think it takes a lot of energy to escape Earth’s gravity, but our planet’s pull is tiny compared to many other things in the Universe. Same for our Sun, the galaxy, or even an extreme object like a neutron star. Instead, imagine a small, compact region of space that’s filled with so much …

Physics

Is That Really Alien Life? Scientists Worry Over False-Positive Signs

The search for life elsewhere in the universe is on the cusp of a new era: When scientists will have the opportunity to study the atmospheres of …

Paranormal