Earth could have grown warm enough for liquid water as far back as 4 billion years ago thanks to massive and frequent solar flares.
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.
NASA's powerful Solar Dynamics Observatory recorded Mercury's 7.5-hour transit. Continue reading →
You can watch the 7.5-hour Mercury transit first-hand through a telescope, provided you have the proper solar filters.
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.
Mark your calendars: The smallest planet in the solar system is about to make a REALLY big entrance.
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.
"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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