In a single century, the salmon population of Washington State's Elwha River shrunk by more than 99 percent. What caused this dramatic decline, and what can be done to turn it around?
Humans have harmlessly harvested coral reefs for thousands—or even hundreds of thousands—of years. So why has our behavior in recent years suddenly put reefs at risk?
How much can you reduce your carbon dioxide emissions? Is it worth it? Learn how simple choices multiplied by everyone in your community can make a big difference.
Meet the little dinosaurs of Ghost Ranch. Investigate evolution and the loss of flight in dinosaurs and birds. And dig deep into the lives of dinosaurs with these recommended reads.
If technology, cost, and terrain permitted, scientists seeking key data on stars in our galaxy would have loved to construct a behemoth 330 m wide telescope atop Mount Wilson, just northeast of Los Angeles. Instead, they arranged six smaller telescopes over an identical area, synchronizing the light to achieve an equally superlative resolution. Called the Center for High Angular Resolution Astronomy (CHARA), the array uses the technique of interferometry to spot details the size of a nickel seen from 16,000 km away. Hear from project astronomers why the labyrinthine engineering required for CHARA's renowned precision is a small sacrifice for the valuable data it gleans on the properties and life cycles of stars.
Watch how a unique dual-satellite mission called GRACE-NASA's Gravity and
Climate Experiment-is revealing an unprecedented view of our water planet.
For background information, educational resources and more, visit Grace:
Tracking Water from Space on the Science Bulletins website,
Science Bulletins is a production of the National Center for Science
Literacy, Education, and Technology (NCSLET), part of the Department of
Education at the American Museum of Natural History. This visualization
was supported by the National Oceanic and Atmospheric Administration
Launched on December 14, 2009, the WISE space telescope is helping scientists create a Digital Universe 3-D Atlas. Take a look at WISE and the data it is capturing.
Scientists have been studying brown dwarfs, or failed stars, for nearly a century. What have they learned? And what answers are they still seeking about these objects stuck somewhere between stars and planets?
Two teams working independently in 1998 came to the same conclusion: An invisible force, one that seems to act opposite gravity, is separating the matter in space at an increasing pace. Find out more about their “jaw-dropping” discovery.