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Newly Selected Citizen Science Proposals: A Peek at What’s Next
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How Many Black Holes Are Hiding?
An effort to find some of the biggest, most active black holes in the universe provides a better estimate for the ratio of hidden to unhidden behemoths.
Searching the Sky about How Many Black Holes Are Hiding?The Universe
Earth Information Center
For more than 50 years, NASA satellites have provided data on Earth's land, water, air, temperature, and climate. NASA's Earth Information Center allows visitors to see how our planet is changing in six key areas: sea level rise and coastal impacts, health and air quality, wildfires, greenhouse gases, sustainable energy, and agriculture.
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Image Of The Day
Earth in Far-Ultraviolet
A color enhancement of a far-ultraviolet photo of Earth taken by astronaut John W. Young, commander, with the ultraviolet camera on April 21, 1972. The original black-and-white photo was printed on Agfacontour film three times, each exposure recording only one light level. The three light levels were then colored blue (dimmest), green (next brightest), and red (brightest).
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