Did NASA's Voyager 1 Spacecraft Just Exit the Solar System? By Natalie Wolchover NASA's Voyager 1 spacecraft has met two criteria indicating it has left the solar system, the first manmade object to do so.
The Physics of the First-Ever Supersonic Skydive By Natalie Wolchover A daredevil will skydive to Earth from 23 miles up on Oct. 8, achieving supersonic speeds during his freefall. Experts explain the physics of this unprecedented act.
Ancient Knots Keep Mars Rover's Laces Tied on Red Planet By Natalie Wolchover On the decks of the Curiosity rover, some of the most advanced equipment ever developed by humans is being held together by some of the oldest forms of human technology: intricate knots.
Have Three Little Photons Broken Theoretical Physics? By Natalie Wolchover A trio of photons emitted seven billion years ago from a gamma ray burst threaten to scrap decades of research by theoretical physicists.
'One Small Step for Man': Was Neil Armstrong Misquoted? By Natalie Wolchover Armstrong always insisted his famous moon quote was a misquote.
Mars Photos by Curiosity Rover Teeming with 'UFOs' By Natalie Wolchover Two weeks in, NASA's Curiosity rover has already caught several alleged UFOs and other anomalies on camera, according to the fringe sector of the Internet.
The Universe Isn't a Fractal, Study Finds By Natalie Wolchover Scientists have long debated whether the universe is a fractal.
Big Bang Was Actually a Phase Change, New Theory Says By Natalie Wolchover Physicists say the Big Bang was a phase change, like water freezing into ice, rather than an explosion. The theory could have big implications.
Why Is Mars Red? By Natalie Wolchover We know that iron oxide makes Mars appear red, but we don't know exactly how so much of the compound got there.
Mystery of the 'Monster Stars' Solved: It Was a Monster Mash By Natalie Wolchover Astronomers have figured out how four previously unexplained "monster stars" could have formed.
What If the Curiosity Rover Finds Life on Mars? By Natalie Wolchover NASA's Curiosity rover will look for complex organic molecules on Mars that would be telltale signs of ancient Martian life. What will happen if it finds some?
'Olympic UFO' Bears Striking Resemblance to a Blimp By Natalie Wolchover The Web has come alive with chatter about a UFO hovering over the opening ceremony of the Olympics. But it sure looks a lot like a blimp.
Why Aren't There Any Openly Gay Astronauts? By Natalie Wolchover There has never been an openly gay or lesbian astronaut at NASA. Sally Ride's legacy could change that.
What Does Space Smell Like? By Natalie Wolchover Astronauts say space has an extremely distinctive, and not unpleasant, smell.
Pluto Remains Shrouded in Mystery By Natalie Wolchover Considering all the mysteries that remain, Pluto's newfound moon almost definitely won't be the last of its surprises.
What Should Pluto's New Moon Be Named? By Natalie Wolchover A fifth moon has been spotted orbiting the dwarf planet Pluto. What will this
How to Tweet to Aliens Tonight By Natalie Wolchover The famous "Wow! signal," a possible alien message, will soon receive a reply from humanity. You can contribute a message via Twitter tonight (June 29).
Possible Alien Message to Get Reply from Humanity By Natalie Wolchover The famous "Wow! signal," a radio transmission that may or may not have been beamed toward Earth by aliens, will soon receive a reply from humanity.
Roswell, Other Famous UFO Claims Get a Fresh Look By Natalie Wolchover Investigators have addressed many of the most famous UFO and alien claims in history. Did they uncover any evidence?
Is Chaos in 'Seeking a Friend for the End of the World' Realistic? By Natalie Wolchover A new film depicts the range of human reactions in the run-up to an Earth-shattering asteroid collision. Is Hollywood's version of events realistic?
Who Is China's First Female Astronaut? By Natalie Wolchover On board China's upcoming mission will be the country's first female astronaut. Who is the Chinese Sally Ride, and how was she chosen?
Wu-Tang Clan Rapper Takes on Space in 'Dark Matter' Album By Natalie Wolchover The hip-hop artist GZA has an album in the works about the magnificence of the cosmos.
Planet X? New Evidence of an Unseen Planet at Solar System's Edge By Natalie Wolchover An astronomer has proposed the existence of an unseen planet in the distant outskirts of the solar system. It would explain the peculiar motions of Kuiper belt objects.
Why the 'Supermoon' Will Look Largest Near the Horizon By Natalie Wolchover There are a couple of theories floating around about why the moon looks larger near the horizon. Either way, be sure to check out the effect during the "supermoon" on Saturday.