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Comet Siding Spring (lower left) passes Mars on October 19, 2014.  Photo by Damian Peach.  Used with permission.
Science Wire | Oct 20, 2014

Best photos: Comet Siding Spring sweeps past Mars

A sight never seen before in recorded history … an encounter between Mars and a close-passing comet on October 19, 2014.

Comet/Mars encounter on Oct. 19, via NASA.
Blogs | Oct 19, 2014

Comet Siding Spring’s near-miss of Mars was October 19

The close pass of Comet Siding Spring to Mars was exciting! Closest approach was October 19. Watch for photos from the event here at EarthSky.org.

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Science Wire | Oct 19, 2014

Video: Comet Siding Spring’s close encounter with Mars

Here’s a 2-minute video on the comet’s October 19 near-miss of Mars, and how orbiting spacecraft will evade onslaught of dust particles from the comet.

Artist's impression of the Milky Way. Its hot halo appears to be stripping away the star-forming atomic hydrogen from its companion dwarf spheroidal galaxies.  Image credit: NRAO/AUI/NSF
Science Wire | Oct 16, 2014

Milky Way strips nearby galaxies of star-forming hydrogen

Astronomers have discovered that our nearest galactic neighbors are devoid of star-forming gas, and that our Milky Way is to blame.

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Science Wire | Oct 16, 2014

What are super-Earths made of?

Astronomers struggle to learn about super-Earths – bigger than our Earth, smaller than Neptune – the most common type of planet found by the Kepler spacecraft.

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Science Wire | Oct 15, 2014

Alright! Hubble finds potential targets for Pluto spacecraft

After a long search at the solar systems’ fringes, scientists say they have three possible targets for the New Horizons spacecraft after its July 2015 Pluto flyby.

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Science Wire | Oct 15, 2014

Spacecraft catches Mars atmosphere in act of escaping

Earth’s atmosphere is leaking into space, too, but only very, very slowly. Meanwhile, Mars is thought to have lost much of its atmosphere already.

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Science Wire | Oct 13, 2014

Milky Way’s dark matter half what we thought?

Australian astronomers say our Milky Way galaxy has only half the dark matter we thought it did. If so, it explains the shortage of Milky Way satellites.

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Science Wire | Oct 12, 2014

Active moon volcanos in geologically recent times

Last volcanic activity on moon thought to be a billion years ago. Now small lava flows on moon’s dark plains suggest activity as recently as 50 million years ago.

Earth and moon from Mercury's orbit
Science Wire | Oct 11, 2014

MESSENGER spacecraft sees lunar eclipse from Mercury

The MESSENGER spacecraft, now orbiting Mercury, caught the images to make this movie of last Wednesday’s lunar eclipse. See Earth and moon from Mercury!