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 →
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.
A huge, heart-shaped sunspot shot off a strong solar flare Sunday evening (April 17), temporarily disrupting radio communications here on Earth.
Was there a so-called 'super-Earth' planet that formed inside the orbit of Mercury? If so, it might have been eaten by our sun.
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