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May 23, 2016 11:00 AM ET // Irene Klotz
Earth could have grown warm enough for liquid water as far back as 4 billion years ago thanks to massive and frequent solar flares.
May 10, 2016 06:45 AM ET // Ian O'Neill
As the Mercury transit unfolded over the Atacama Desert, astronomers remembered the pioneering calculations that were made to begin to understand the scale of the universe.
May 9, 2016 04:55 PM ET // Tariq Malik,
NASA's powerful Solar Dynamics Observatory recorded Mercury's 7.5-hour transit. Continue reading →
May 9, 2016 09:57 AM ET // Elizabeth Howell
You can watch the 7.5-hour Mercury transit first-hand through a telescope, provided you have the proper solar filters.
May 6, 2016 12:19 PM ET // Jason Major
Surprisingly, Pluto is able to maintain a gravitational grasp on much of its atmosphere even as ions are being stripped away by the solar wind.
May 3, 2016 11:07 PM ET // Ian O'Neill
Mark your calendars: The smallest planet in the solar system is about to make a REALLY big entrance.
May 3, 2016 07:13 AM ET // Bianca Nogrady, ABC Science Online
The discovery is the first evidence supporting the hypothesis that very low-mass, low-temperature stars should have Earth-sized or smaller planets orbiting them.
Apr 21, 2016 06:46 AM ET
"Get more sun!" we're told, when we need to bulk up on our vitamin D. Fair enough, but how does merely walking outdoors turn us into vitamin factories?
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