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Close Approach Comets Poster
Solar System, Sky Watching
Apr 20, 2017
In 2017 and 2018, three comets will pass near the Earth providing the opportunity to observe and study these icy interlopers.
Sun
Dec 16, 2014
Dec. 16, 2014:  Since 2012, NASA's Voyager 1 spacecraft has experienced three 'tsunami waves' in interstellar space.  The most recent, which reached the spacecraft earlier this year, is still propagating outward according to new data. It is the longest-lasting shock... Read More
Earth, Solar System
Dec 16, 2014
Dec. 16, 2014: NASA's Mars Curiosity rover has measured a tenfold spike in methane, an organic chemical, in the atmosphere around it and detected other organic molecules in a rock-powder sample collected by the robotic laboratory’s drill.
Solar System
Dec 14, 2014
Dec. 14, 2014: Observations by NASA’s Curiosity Rover indicate Mars' Mount Sharp was built by sediments deposited in a large lake bed over tens of millions of years. This suggests ancient Mars maintained a climate that could have produced long-lasting lakes at many locations on the Red Planet.
Universe
Dec 14, 2014
Dec. 14, 2014: Where did our planet get its oceans? Among planetary scientists, this is one of the most important and perplexing questions about the origins of Earth. One popular theory holds that water was brought to Earth by the ancient impacts of comets and... Read More
Solar System
Dec 12, 2014
Earth is passing through a stream of debris from "rock comet" 3200 Phaethon, source of the annual Geminid meteor shower. Forecasters expect as many as 120 meteors per hour when the shower peaks on Dec. 13-14.
ScienceCasts: Embers from a Rock Comet: The 2014 Geminid Meteor Shower
Sun, Solar System
Dec 12, 2014
Dec. 12, 2014: December has arrived, and for backyard sky watchers that means one thing:  It is time for the annual Geminid meteor shower. Every year in early December, Earth passes through a stream of gravelly, dusty debris from "rock comet" 3200 Phaethon.  This... Read More
Solar System
Dec 7, 2014
Dec. 7, 2014: After a voyage of nearly nine years and three billion miles —the farthest any space mission has ever traveled to reach its primary target – NASA’s New Horizons spacecraft came out of hibernation on Dec. 6th for its long-awaited 2015 encounter with the Pluto system.
Solar System
Dec 5, 2014
Dec. 5, 2014: NASA marked a major milestone Friday on its journey to Mars as the Orion spacecraft completed its first voyage to space, traveling farther than any spacecraft designed for astronauts has been in more than 40 years.
Earth
Dec 4, 2014
Dec. 4, 2014: The world is getting warmer.
Universe
Dec 4, 2014
Dec. 4, 2014: On Dec. 3, the Japan Aerospace Exploration Agency (JAXA) successfully launched its Hayabusa2 mission to rendezvous with an asteroid, land a small probe plus three mini rovers on its surface, and then return samples to Earth. NASA and JAXA are cooperating on the science of the... Read More
Earth
Dec 2, 2014
Arctic and Antarctic sea ice are both affected by climate change, but the two poles of Earth are behaving in intriguingly different ways.
ScienceCasts: Climate Change and the Yin-Yang of Polar Sea Ice
Earth, Solar System
Nov 28, 2014
Nov 28, 2014: The ruddy color of Jupiter's Great Red Spot is likely a product of simple chemicals being broken apart by sunlight in the planet's upper atmosphere, according to a new analysis of data from NASA's Cassini mission. The results contradict the other leading theory for... Read More
Earth, Sun
Nov 27, 2014
Nov 27, 2014: Two donuts of seething radiation that surround Earth, called the Van Allen radiation belts, have been found to contain a nearly impenetrable barrier that prevents the fastest, most energetic electrons from reaching Earth.
Solar System
Nov 24, 2014
The Moon might not be as dead as it looks. Researchers using NASA's Lunar Reconnaissance Orbiter have found signs of geologically-recent volcanic eruptions on Earth's natural satellite.
ScienceCasts: Young Volcanoes on the Moon