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Hubble’s Contentious Constant Poster
Universe
Sep 20, 2017
There are two leading ways to measure the universe's rate of expansion, and for fifteen years, they more or less agreed with one another. Not anymore, and that’s a big deal.
Solar System
Jun 3, 2014
June 3, 2014:  A spacecraft from Earth is about to do something no spacecraft has ever done before: orbit a comet and land on its surface. Right now, the European Space Agency's Rosetta probe is hurtling toward Comet 67P/Churyumov-Gerasimenko.  The spacecraft's mission is to study the... Read More
Solar System
Jun 2, 2014
Later this year, Europe's Rosetta probe will orbit and land on comet 67P/Churyumov–Gerasimenko. New images of the comet show that it will be a lively place when Rosetta arrives.
ScienceCasts: Rosetta Comet Comes Alive
Earth, Solar System
Jun 2, 2014
June 2, 2014: It only sounds like science fiction. To test a new technology for landing heavy payloads on Mars, NASA is about to drop a flying-saucer shaped vehicle from a helium balloon high above Earth's surface. The first launch opportunity for the Low Density Supersonic Decelerator (LDSD)... Read More
Universe
May 27, 2014
A new map of the galaxy by ESA's Planck spacecraft has revealed gigantic loops of magnetism and other structures that point to a magnetic dynamo at work in the Milky Way.
ScienceCasts: The Milky Way is Not Just a Refrigerator Magnet
Earth
May 19, 2014
The Jason-2 satellite sees something brewing in the Pacific. Researchers say it could be a significant El Niño with implications for global weather and climate.
ScienceCasts: El Nino - Is 2014 the New 1997?
Earth
May 19, 2014
May 19, 2014:  Every ten days, the NASA/French Space Agency Jason-2 satellite maps all the world's oceans, monitoring changes in sea surface height, a measure of heat in the upper layers of the water.   Because our planet is more than 70% ocean, this information... Read More
Solar System
May 15, 2014
May 15, 2014: Jupiter's trademark Great Red Spot -- a swirling anti-cyclonic storm larger than Earth -- has shrunk to its smallest size ever measured. According to Amy Simon of NASA's Goddard Space Flight Center in Greenbelt, Maryland, recent NASA Hubble Space... Read More
Earth
May 12, 2014
A new study led by NASA researchers shows that half-a-dozen key glaciers in the West Antarctic Ice Sheet are in irreversible decline. The melting of these sprawling icy giants will affect global sea levels in the centuries ahead.
ScienceCasts: No Turning Back - West Antarctic Glaciers in Irreversible Decline
Earth
May 12, 2014
May 12, 2014: Over the years, as temperatures around the world have ratcheted upward, climate change researchers have kept a wary eye on one place perhaps more than any other:  The West Antarctic Ice Sheet, and particularly the fastest melting part of it, the glaciers that... Read More
Solar System
May 6, 2014
May 6, 2014: The head of NASA's Meteoroid Environment Office, Dr. Bill Cooke, often lets cameras do his sky watching for him.  He and his colleagues operate a nationwide network of automated fireball observatories that capture anything that burns into Earth’s... Read More
Solar System
May 5, 2014
Sky watchers in North America could witness a new meteor shower on May 24th when, for the first time, Earth passes through a cloud of dust from periodic comet 209P/LINEAR.
ScienceCasts: NASA on the Lookout for a New Meteor Shower
Sun
May 2, 2014
May 2, 2014: Last month (April 8-11), scientists, government officials, emergency planners and others converged on Boulder, Colorado, for NOAA's Space Weather Workshop—an annual gathering to discuss the perils and probabilities of solar storms.  The current... Read More
Sun
Apr 28, 2014
Two years ago, an intense solar storm narrowly missed Earth. If it had hit, researchers say, we could still be picking up the pieces.
ScienceCasts: Carrington-class CME Narrowly Misses Earth
Apr 26, 2014
Apr. 26, 2014: It's spring, and all around the northern hemisphere gardeners are planting seeds, tilling soil, and watering crops. Imagine a gardener's surprise, however, if water from the hose, instead of hitting the soil and sinking in, floated up to the sky. Or if the soil... Read More