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  Supporters of Egypt’s army crowd the streets 

NASA Telescope Snaps 1st Photos of Mystery Region on the Sun

NASA's newest solar observatory has taken its first photos of the lowest layers of the solar atmosphere, a mysterious and little-understood region of the sun. Full story

NASA telescope to probe long-standing solar mystery

CAPE CANAVERAL, Florida (Reuters) - A small NASA telescope was poised for launch on Thursday on a mission to determine how the sun heats its atmosphere to millions of degrees, sending off rivers of particles that define the boundaries of the solar system. Full story

Haze on Saturn's Moon Titan Is Similar to Earth's Pollution

On Earth, polycyclic aromatic hydrocarbons, or PAHs, are best known as carcinogens and environmental pollutants, produced as byproducts of fuel burning. It turns out these complex hydrocarbons are also contributing to the thick orange-brown smog that cloaks Saturn's largest moon, Titan, researchers Full story

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Time to wake up: Republicans boycott vote on EPA nominee

How Cirrus Clouds Form — And Why It Matters

How Plants May Help Offset Global Warming

'Dark Lightning' Sparks Call for More Earth-Gazing Satellites

Bumpier Flights Ahead on Warming Planet, Study Suggests

Cause of Odd Arctic Ozone 'Hole' Found

What If Your Town Were Hit by a Meteor?

Satellite Sees Russian Meteor Explosion from Space

Water Leaking Into Stratosphere Could Harm Ozone

Loads of Microbes Found High in Atmosphere


  More severe weather possible Saturday

Dylan Dreyer tracks where the storms may be heading this weekend, from Texas to Ohio.

  Scientists issue dire warning about global warming

The amount of carbon dioxide in the atmosphere has surpassed a threshold that scientists say signals we are running out of time to reverse the impact of global warming. NBC’s Anne Thompson reports.

  Sen. Sheldon Whitehouse’s climate change Senate smack down

As Republicans block President Obama's nominee to head the EPA, Chris Hayes notes that carbon in the atmosphere is about to hit its highest level since the Pliocene Era, three to five million years ago, and Senator Sheldon Whitehouse smacks down a colleague who says God won't allow us to ruin the Ea

  A call for respect on Cesar Chavez Day

Chico State students rally against racially-tinged party atmosphere that has become common on holiday that honors civil rights and labor leader Cesar Chavez. KNVN's Bryan Callahan reports.

  Meteor flashes in the sky

A meteor put on a spectacular show Friday as it entered the atmosphere on the East Coast. NBC’s Michelle Franzen reports.

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Related Photos

The first observations of the lowest layers of the sun's atmosphere are seen in a handout image from NASA's IRIS spacecraft
The first observations of the lowest layers of the sun's atmosphere are seen in a handout image from NASA's IRIS spacecraft

The first observations of the lowest layers of the sun's atmosphere are seen in a handout image from NASA's Interface Region Imaging Spectrograph spacecraft released July 25, 2013. IRIS's first images show a multitude of thin, fiber-like structures that have never been seen before. The images also

Sun pillars - atmosphere phenomenom caused by refraction of sunlight through ice crystals in the atmosphere.Location: Arctic Ocean, north of western RussiaPhoto Date: 2006 September 8Photographer: Mike Dunn, NC State Museum of Natural SciencesCredit: NOAA Climate Program Office, NABOS 2006 Expe

Mars and solar wind
Mars and solar wind

An artist's conception shows how Mars' atmosphere was stripped away by charged particles from the sun.

"12-12-12 The Concert For Sandy Relief" Production Load-In
"12-12-12 The Concert For Sandy Relief" Production Load-In

NEW YORK, NY - DECEMBER 11: A general view of atmosphere at "12-12-12 The Concert For Sandy Production" Load-In at Madison Square Garden on December 11, 2012 in New York City.