Paul M. Sutter is an astrophysicist at SUNY Stony Brook and the Flatiron Institute in New York City. Paul received his PhD in Physics from the University of Illinois at Urbana-Champaign in 2011, and spent three years at the Paris Institute of Astrophysics, followed by a research fellowship in Trieste, Italy, His research focuses on many diverse topics, from the emptiest regions of the universe to the earliest moments of the Big Bang to the hunt for the first stars. As an 'Agent to the Stars,' Paul has passionately engaged the public in science outreach for several years. He is the host of the popular 'Ask a Spaceman!' podcast, author of 'Your Place in the Universe' and 'How to Die in Space' and he frequently appears on TV — including on The Weather Channel, for which he serves as Official Space Specialist.
, they become agitated, with the light elements sublimating from the surface to form a coma, and sometimes even a tail of gas that can stretch for millions of miles.So asteroids and comets are very different. But in 1950, astronomers found the first-ever signs of activity around an unexpected place. They discovered that asteroid Wilson-Harrington has a coma, just like a comet does. But the object definitely wasn't a comet.
In the past 70 years, astronomers have identified fewer than 30 active asteroids, and they still present a major mystery to our understanding of the evolution of theHere come the Centaurs The active asteroids are telling us something important about the history of the solar system. For example, one of the major outstanding mysteries in planetary evolution is. Our planet originally formed with a lot of water, but most of it either boiled off when Earth's surface was molten or got locked up deep within the mantle. To get water on the planet's surface requires some sort of delivery system.
Thankfully, these active asteroids are not alone. There's another distinct population of small bodies inhabiting the solar system: the Centaurs. These asteroid-like objects sit between the orbits of
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