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Our early solar system was a wild place. Dust grains grew into pebbles, and pebbles became world-building planetesimals. These rocks spun around and bumped into each other in a chaotic dance that left a trail of debris in its wake. The remnants of these festivities remain strewn about our cosmic backyard. Many rocky and metallic bodies now orbit in what’s called the Main Asteroid Belt, between Mars and Jupiter.
More than just leftovers, asteroids offer clues to the earliest days of our sol ...read more
The full text of this article is available to Discover Magazine subscribers only.
Subscribe and get 10 issues packed with:
The latest news, theories and developments in the world of science
Compelling stories and breakthroughs in health, medicine and the mind
Environmental issues and their relevance to daily life
Cutting-edge technology and its impact on our future
...read more
The full text of this article is available to Discover Magazine subscribers only.
Subscribe and get 10 issues packed with:
The latest news, theories and developments in the world of science
Compelling stories and breakthroughs in health, medicine and the mind
Environmental issues and their relevance to daily life
Cutting-edge technology and its impact on our future
...read more
Atop Earth’s largest active volcano, an alarm bell has tolled unheeded for six decades. In 1958, Scripps Institution climatologist Charles Keeling began making precise measurements of atmospheric carbon dioxide concentrations at Mauna Loa Observatory. Back then, Earth’s atmosphere clocked roughly 310 parts per million (ppm) of carbon dioxide. It took just a year for Keeling to spot a now-familiar upward trend.
“You can think of it as taking planetary vital signs,” says Ra ...read more
Author Vishay SinghPosted on Categories Discover Magazine
