Nell Greenfieldboyce Nell Greenfieldboyce is a NPR science correspondent.

An artist's representation of NASA's Transiting Exoplanet Survey Satellite, or TESS, observing an M dwarf star with orbiting planets. NASA Goddard Space Flight Center hide caption

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NASA Goddard Space Flight Center

Get Ready For the Next Big Thing In NASA's Search For Earth's Twin

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An artist's rendering shows the Milky Way where a supermassive black hole lies at the center. A dozen smaller black holes have now been detected, and a new study suggests the monster is surrounded by about 10,000. Spitzer Space Telescope/NASA/JPL-Caltech/R. Hurt (SSC/Caltech) hide caption

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Spitzer Space Telescope/NASA/JPL-Caltech/R. Hurt (SSC/Caltech)

Center Of The Milky Way Has Thousands Of Black Holes, Study Shows

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Dr. Garen Wintemute at the University of California, Davis, Medical Center, says of the new authority given to the Centers for Disease Control and Prevention: "There's no funding. There's no agreement to provide funding. There isn't even encouragement." Rich Pedroncelli/AP hide caption

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Rich Pedroncelli/AP

Government Spending Bill Could Change How Health Agencies Study Guns

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A model of the Tiangong-1 space station at a Chinese airshow in 2010. The real Tiangong-1 will reenter the atmosphere around the end of March. Kin Cheung/AP hide caption

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Kin Cheung/AP

A Chinese Space Lab Will Soon Fall From The Sky. Where It Lands, No One Knows

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Colored transmission electron micrograph of a section through an Escherichia coli bacterium. This rod-shaped bacterium moves via its hair-like flagellae (yellow). Kwangshin Kim/Science Source hide caption

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Kwangshin Kim/Science Source

Artist's rendering of how the first stars in the universe may have looked. N.R.Fuller/National Science Foundation/Nature hide caption

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N.R.Fuller/National Science Foundation/Nature

Did Dark Matter Make The Early Universe Chill Out?

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A Przewalski mare with her foal at the Highland Wildlife Park in Kingussie, Scotland, in 2013. It turns out that Przewalski's horses are actually feral descendants of the first horses that humans are known to have domesticated, around 5,500 years ago. Jeff J. Mitchell/Getty Images hide caption

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Jeff J. Mitchell/Getty Images

Why The Last 'Wild' Horses Really Aren't

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Smallpox virus, colorized and magnified in this micrograph 42,000 times, is the real concern for biologists working on a cousin virus — horsepox. They're hoping to develop a better vaccine against smallpox, should that human scourge ever be used as a bioweapon. Chris Bjornberg/Science Source hide caption

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Chris Bjornberg/Science Source

Did Pox Virus Research Put Potential Profits Ahead of Public Safety?

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Space Enthusiasts Gather In Florida As Powerful Rocket Is Set To Launch

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The Falcon Heavy is the latest advance from the rocket company SpaceX, and it's a step toward the company's goal of sending people to Mars. SpaceX hide caption

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SpaceX

SpaceX Set To Launch World's Most Powerful Rocket

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Night Light Increasing Around The World

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Two bonobos play fight at the Lola Ya Bonobo sanctuary in Democratic Republic of Congo in 2012. Emilie Genty/Barcroft Media via Getty Images hide caption

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Emilie Genty/Barcroft Media via Getty Images

Unlike Humans, Bonobos Shun Helpers And Befriend The Bullies

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