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Sun may delay plans for sending humans to Mars
Less solar activity indicates a weaker magnetic field on the sun. A weak field lets cosmic rays into the solar system, posing a radiation hazard for astronauts.
October 23, 2014
New 3D map of the cosmic web
A team of astronomers has created the first three-dimensional map of the adolescent universe, just 3 billion years after the Big Bang.
October 21, 2014
Video: Solar eclipse on October 23
Weather permitting, almost everyone in North America will be able to see the partial solar eclipse this Thursday.
October 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.
October 20, 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.
October 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.
October 19, 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.
October 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 exoplanet found.
October 16, 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.
October 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.
October 15, 2014
