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22 April 2014, 11:32 PM ET
This space wallpaper of a galaxy cluster taken by the NASA/ESA Hubble Space Telescope gives a remarkable cross-section of the Universe, showing objects at different distances and stages in cosmic history.
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, 01:58 PM ET
In 2013 and 2014, areas around the globe have experienced record breaking temperatures over extended periods of time. This has led to a diminished water supply, thriving disease carrying insects and fire.
22 April 2014, 12:21 PM ET
Long before the first Instagram from space, the first check-in from orbit, or even the first astronaut's tweet, John Glenn sent an email to President Bill Clinton. The reply it prompted was the very first email transmitted by a sitting U.S. president — it
22 April 2014, 11:02 AM ET
The M2-F3 is launched from the B-52 Mothership.
22 April 2014, 10:53 AM ET
Since the start of the 21st century, dozens of incoming asteroids have slammed into Earth, some of them packing far more energy than a city-destroying atomic bomb, a new animation illustrates.
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, 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.
22 April 2014, 03:40 AM ET
NASA has long held the lead in the exploration of Mars, and that trend will continue, says NASA administrator Charles Bolden.
22 April 2014, 02:24 AM ET
The Triangulum Galaxy (M33) that is about 3 million light-years away from Earth. Among its most distinctive features are ionized hydrogen clouds, which are massive regions of starbirth.
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, 12:09 PM ET
This is an early version of the modern computer.
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.