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David Callejas

Lake Travis

Image taken by our friends at Lake Travis Boat Rentals, the best place to go for Float On –lake travis boat rentals in the Austin, TX area.


Two planets destined to die as their star expands

You know how our sun will someday swell to a red giant, swallowing the planets Mercury and Venus? These two distant exoplanets will suffer a similar fate.

Illustration by Haven Giguere

Diamond planets more common than astronomers thought?

Study suggests that extraterrestrial worlds can be extremely diverse in their chemical compositions, including many that are drastically different from our earthly experience.

Possibly habitable environs
Braided fluvial channels (inset) emerge from the edge of glacial deposits roughly 210 million years old on the martian volcano Arsia Mons, nearly twice as high as Mount Everest. (Colors indicate elevation.) Image credit: NASA/Goddard Space Flight Center/Arizona State University/Brown University

Habitable environment on Martian volcano?

A volcano erupting under an immense glacier would have created large lakes of liquid water on Mars in the relatively recent past. And where there’s water, there’s the possibility of life.

Australian drought, via GreenPacks

Seeking safe havens for biodiversity, as climate changes

Australian researchers say their new technique will help them find sites where populations of organisms can potentially survive, as rainfall continues to decline.


Heat from the lava flows at Klyuchevskaya

A recently released NASA image of the ongoing 2013 eruption at Klyuchevskaya, one of Russia’s tallest and most active volcanoes.


Draconid meteors

A couple of Draconid meteors caught on camera by Richard Turner in early October, 2011.


Venus and Saturn above the fog

Venus and Saturn above the fog on Sunday September 15, 2013 about 65 minutes after sunset photographed by Bob King aka Astro Bob.


Infrared star trails over Texas

Star trails in the Texas night sky – in infrared, popularly known as “heat radiation” – from EarthSky Facebook friend Manish Mamtani Photography.


Frog photobombs NASA moon launch

NASA has confirmed this is a real photo. This frog made its giant leap for frogkind during the launch of NASA’s LADEE moon craft on September 6.