SANTA CRUZ, CA–Giant insects ruled the prehistoric skies during periods when Earth's atmosphere was rich in oxygen. Then came the birds. After the evolution of birds about 150 million years ago, insects got smaller despite rising oxygen levels, according to a new study by scientists at the University of California, Santa Cruz.
As the world awaits the historic transit of Venus across the face of the sun, an occurrence that will not happen again until 2117, weather in the best viewing location isn't cooperating.
Sunspot 1476, the most prominent feature in our field of view on the sun last month, is now rotating back into view. It now has the designation 1493.
NASHVILLE, Tenn. – Enormous volcanic eruptions with potential to end civilizations may have surprisingly short fuses, researchers have discovered.