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?

I’ve Always Wondered: Why are the volcanoes on Earth active, but the ones on Mars are not? Helen Maynard-Casely, Australian Nuclear Science and Technology Organisation…

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The motion of the S2 star passing through the extreme gravitational field near the supermassive black hole in the centre of the Milky Way. European Southern Observatory

Why starlight turns red escaping from black hole at heart of Milky Way

Why starlight turns red escaping from black hole at heart of Milky Way eso a CROP. Indranil Banik, University of St Andrews For the past…

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Colorful view of universe as seen by Hubble in 2014. NASA, ESA, H. Teplitz and M. Rafelski (IPAC/Caltech), A. Koekemoer (STScI), R. Windhorst (Arizona State University), and Z. Levay (STScI)

The universe’s rate of expansion is in dispute – and we may need new physics to solve it

The universe’s rate of expansion is in dispute – and we may need new physics to solve it Colorful view of universe as seen by…

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An artist’s impression of the path of star S2 as it passes very close to the supermassive black hole at the centre of the Milky Way. The very strong gravitational field causes the colour of the star to shift slightly to the red. (Size and colour exaggerated for clarity.) ESO/M. Kornmesser, CC BY

Einstein’s theory of gravity tested by a star speeding past a supermassive black hole

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Triple star system involving a pulsar suggests Einstein was right. Kevin Gill/Flickr, CC BY-ND

Free-falling dead stars show that a cornerstone of physics holds up

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An artist’s impression of interstellar object `Oumuamua, assuming it’s a rock. ESO/M. Kornmesser, CC BY

Comet or asteroid? Mysterious ‘Oumuamua shows why we may need a new classification system

Comet or asteroid? Mysterious ‘Oumuamua shows why we may need a new classification system Artist’s impression of the interstellar object. ESO/M. Kornmesser, CC BY Monica…

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Blast off. Sergey Nivens

Eight ethical questions about exploring outer space that need answers

Eight ethical questions about exploring outer space that need answers Blast off. Sergey Nivens Benjamin Sachs, University of St Andrews Metallic shrapnel flying faster than…

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When galaxies align. NASA

How we proved Einstein right on galactic scales – and what it means for dark energy and dark matter

How we proved Einstein right on galactic scales – and what it means for dark energy and dark matter When galaxies align. NASA Thomas Collett,…

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Artist conception of a tidal disruption event (TDE) that happens when a star passes fatally close to a supermassive black hole. Sophia Dagnello, NRAO/AUI/NSF., Author provided

Astronomers watch as black hole drags an exploding star to its death

Astronomers watch as black hole drags an exploding star to its death Artist conception of a tidal disruption event (TDE) that happens when a star…

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An image of the galaxy Arp299B, which is undergoing a merging process with Arp299A (the galaxy to the left), captured by NASA's Hubble space telescope. The inset features an artist's illustration of a tidal disruption event (TDE), which occurs when a star passes fatally close to a supermassive black hole. A TDE was recently observed near the center of Arp299B. Credits: Sophia Dagnello, NRAO/AUI/NSF; NASA, STScI

Astronomers See Distant Eruption as Black Hole Destroys Star

Astronomers See Distant Eruption as Black Hole Destroys Star For the first time, astronomers have directly imaged the formation and expansion of a fast-moving jet…

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Artist's rendering of the twin spacecraft of the Gravity Recovery and Climate Experiment Follow-On (GRACE-FO) mission, scheduled to launch in May, 2018. GRACE-FO will track the evolution of Earth's water cycle by monitoring changes in the distribution of mass on Earth. Image credit: NASA/JPL-Caltech

GRACE-FO Turns on ‘Range Finder,’ Sees Mountain Effects

GRACE-FO Turns on ‘Range Finder,’ Sees Mountain Effects Recently Launched Twin Satellites Create ‘The Himalaya Plot’ Less than three weeks after launch, the Gravity Recovery…

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