22 April 2014, 06:48 PM ET
ISS Commander Koichi Wakata and Flight Engineers Richard Mastracchio and Steve Swanson have a message to share with the world on April 22nd, 2014, Earth Day. -- Satellite's Earth Day Photo: http://goo.gl/iXd3z8
22 April 2014, 04:47 PM ET
See photos of SpaceX's innovative F9R, the Falcon 9 Reusable rocket prototype, as it soars through test flights. The SpaceX F9R rocket is a Falcon 9 booster first stage equipped with landing legs and a vertical landing system.
22 April 2014, 04:46 PM ET
A U.S. satellite has captured the ultimate Earth Day view from space, showing the entire planet in a stunning group shot of humanity. The photo, taken today (April 22) to mark Earth Day, was captured by the GOES-East satellite at 7:45 a.m. EDT (1145 GMT)
22 April 2014, 02:00 PM ET
Why can't anything travel faster than the speed of light? Do black holes really suck? And why is the universe expanding? These are just a few of the questions author and astrophysicist Jeffrey Bennett answers in his new book, "What is Relativity?"
22 April 2014, 02:00 PM ET
Many people with a basic knowledge of physics know that Einstein developed the theory of relativity, yet few people actually understand what it means. But author and astrophysicist Jeffrey Bennett relativity should be something anyone can understand.
22 April 2014, 09:20 AM ET
Between 2000 and 2013, 26 explosions ranging from 1-600 kilotons have been detected by the Nuclear Test Ban Treaty Organization's network of sensors. -- FULL STORY: http://goo.gl/pKFcCq
22 April 2014, 07:49 AM ET
Today marks the annual celebration of our home planet.NASA has a slew of live events planned to highlight what makes Earth so special. NASA also has many online activities available, too. Here's our NASA Earth Day guide.
22 April 2014, 07:01 AM ET
Sending astronauts to the surface of Mars has been a longtime goal for NASA and other space exploration agencies. That Martian goal takes center stage in a Washington, D.C. conference, and you can watch it live online.
22 April 2014, 07:00 AM ET
Watch scientists, NASA officials and Mars exploration advocates discuss manned missions to the Red Planet during the Humans 2 Mars summit, which runs from April 22-24, 2014.
22 April 2014, 06:30 AM ET
Houston has landed a new partner in its bid to establish its own spaceport in the form of a private spaceflight company that may someday land its mini space shuttle in the city.
22 April 2014, 06:30 AM ET
Light pollution doesn't just make it more difficult for professional and backyard astronomers to observe the heavens, according to a film called "Losing the Dark." It also disrupts wildlife, wastes resources and adversely impacts human health.
22 April 2014, 06:16 AM ET
The Milky Way is a spiral galaxy — but what exactly does it look like? Does it have two, four, or more arms? Astronomers think that now they’re one step closer to the answer.
21 April 2014, 07:30 PM ET
NASA and the online Slooh community telescope will host separate webcasts featuring the Lyrid meteor shower tonight (April 21) and into the wee hours of Tuesday (April 22) morning. Here's how to watch live.
21 April 2014, 06:06 PM ET
Most adults in the United States are not convinced that the universe began with the Big Bang, according to a new Associated Press-GfK poll.
21 April 2014, 05:30 PM ET
NASA is developing a new spacecraft to take mankind to deep space, and high school students will have an important role in designing it.
21 April 2014, 04:12 PM ET
The scientist who discovered the age of the Earth also helped end the use of lead in gasoline and other products in the United States.
21 April 2014, 04:03 PM ET
Cosmic rays hitting Earth can be trapped in ice, producing radioactive Krypton-81. Scientists have accurately dated a million year old sample through melting ancient ice, and passing the ancient air through an Atom Trap Trace Analyzer.
21 April 2014, 03:47 PM ET
Opportunity has been given a new lease on life after the Red Planet gave the tenacious Mars rover a power-boosting spring clean, blasting dust off its solar panels. Opportunity is still going strong more than 10 years after landing on Mars.
21 April 2014, 03:17 PM ET
A super-bright meteor exploded over the northern Russian city of Murmansk early Saturday morning (April 19), a little more than a year after another airburst lit up the skies above Chelyabinsk, about 1,300 miles to the southeast.
21 April 2014, 01:37 PM ET
The CASIS ARK-1 mission, recently delivered to the ISS, will try to grow Huntington protein crystals for study on Earth. Crystals can grow larger in the microgravity of Low Earth Orbit (LEO).
21 April 2014, 01:21 PM ET
The U.S. Air Force's mysterious robotic X-37B space plane is sailing toward the 500-day mark in Earth orbit on a secret military mission. The X-37B space plane launched on Dec. 11, 2012, and is out the Orbital Test Vehicle 3 (OTV-3) mystery mission.
21 April 2014, 12:59 PM ET
Light pollution not only threatens astronomy, it disrupts wildlife, and affects human health. The yellow glows over cities and towns — seen so clearly from space — are testament to the billions spent in wasted energy from lighting up the sky.
21 April 2014, 11:22 AM ET
The Dragon cargo capsule, from private rocket transport company SpaceX was captured by the robotic arm and docked to international Space Station on April 20th, 2014.
21 April 2014, 11:14 AM ET
Were it not for John C. Houbolt, the United States might never have landed men on the moon. The engineer, who died at the age of 95, sold the nation's space program leaders on an alternate flight plan, called Lunar Orbit Rendezvous (LOR).
21 April 2014, 11:08 AM ET
The Lyrid meteor shower peaks tonight (April 21) and you can watch the shooting star action live online.
21 April 2014, 07:00 AM ET
The Hubble image, released today, is a 14-hour exposure that shows objects about 1 billion times fainter than the naked eye can see. Most of the visible galaxies lie less than 5 billion light-years away, but some objects are much more distant.
20 April 2014, 08:40 PM ET
SpaceX’s F9R reusable rocket prototype launches on its first test flight, a vertical liftoff and landing test that carried the rocket 250 meters above a test pad in McGregor, Texas. SpaceX Grasshopper Scares Cows: http://goo.gl/u5KfQh
20 April 2014, 10:20 AM ET
See photos from SpaceX's third Dragon space capsule mission to deliver supplies to the International Space Station for NASA. The mission launches April 18, 2014 from Cape Canaveral, Fla.
20 April 2014, 10:18 AM ET
A commercial Dragon cargo ship built by SpaceX made an Easter delivery to the International Space Station Sunday (April 20) to deliver tons of gear, supplies and even some treats for the astronauts on board.
20 April 2014, 08:00 AM ET
At issue is the ability to combine space data with outputs from a global network of seismic, infrasound and hydroacoustic sensors that have been deployed worldwide to provide treaty verification for a nuclear test ban.
20 April 2014, 06:30 AM ET
SpaceX's unmanned Dragon spacecraft launched on Friday afternoon riding a SpaceX Falcon 9 rocket to orbit. Dragon is due to be grappled by the space station's robotic arm at 7:14 a.m. EDT Sunday.
19 April 2014, 09:05 AM ET
Carl Sagan launched 'Cosmos,' an epic 1980 TV series that brought science to the public like never before. Now, Sagan's legacy lives on in 'Cosmos: A Spacetime Odyssey' — a 13-episode series airing on Fox. See our complete coverage.
19 April 2014, 07:00 AM ET
From five volcanoes erupting at once to a cross-section of the universe, don't miss these amazing space images of the week for April 19, 2014.
19 April 2014, 07:00 AM ET
From a stunning time-lapse of the Milky Way to the Blood moon, don't miss these amazing night sky images by stargazers and Space.com readers.
19 April 2014, 06:30 AM ET
Fox has a new app for space fans who need more than their weekly dose of "Cosmos." Available for the iPhone and Android, the free app lets users carry the show's sleek CGI graphics in their pocket, with previews and clips of the 13 episodes.
18 April 2014, 07:07 PM ET
SpaceX's audacious plan to land part of a rocket in the ocean after launching it to space may not have gone perfectly, but the private spaceflight company's founder still considers it a success, one that could help lead to reusable rockets in the future.