A composite image of Olympus Mons on Mars, the tallest known volcano and mountain in the Solar System. Author: NASA

I’ve Always Wondered: Why are the volcanoes on Earth active, but the ones on Mars are not?

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Pie in the sky? Mars Ice Home concept. NASA/Clouds AO/SEArch

Sorry Elon Musk, but it’s now clear that colonising Mars is unlikely – and a bad idea

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Mars’ south polar cap, as seen from Mars Global Surveyor. Buried beneath, we now know, is a lake of liquid water. NASA/JPL/MSSS

Discovered: a huge liquid water lake beneath the southern pole of Mars

Discovered: a huge liquid water lake beneath the southern pole of Mars Mars’ south polar cap, as seen from Mars Global Surveyor. Buried beneath, we…

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Proton aurora at Mars. First, a solar wind proton approaches Mars at high speed and encounters a cloud of hydrogen surrounding the planet. The proton steals an electron from a Martian hydrogen atom, thereby becoming a neutral atom. The atom passes through the bowshock, a magnetic obstacle surrounding Mars, because neutral particles are not affected by magnetic fields. Finally, the hydrogen atom enters Mars' atmosphere and collides with gas molecules, causing the atom to emit ultraviolet light. Credits: NASA/MAVEN/Goddard Space Flight Center/Dan Gallagher

NASA’s MAVEN Spacecraft Finds That “Stolen” Electrons Enable Unusual Aurora on Mars

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Edwin E. ‘Buzz’ Aldrin Jr. poses for a photograph beside the U.S. flag deployed on the moon during the Apollo 11 mission on July 20, 1969. Neil A. Armstrong/NASA/AP Photo

Who owns the moon? A space lawyer answers

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The Blood Moon from January 31, 2018. Our second chance to see an eclipsed Moon this year is coming up on July 28. Martin George, Author provided

It’s a busy night sky this July, so make sure you look up

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Fragments of the asteroid 2018 LA scattered over a wide area in Botswana’s Central Kalahari Game Reserve. Alexander Proyer

Rare meteorite recovery in Botswana can help reveal secrets of outer space

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Artist’s rendering of a Mars artificial gravity transfer vehicle. NASA

Method of making oxygen from water in zero gravity raises hope for long-distance space travel

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Blast off. Sergey Nivens

Eight ethical questions about exploring outer space that need answers

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