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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
How often might Hawaii get a monster tsunami?
Scientists say that the tsunami that hit Japan in 2011 was a thousand-year event. A monster wave might strike Hawaii about as often.
October 20, 2014
First-ever image of 5th order rainbow!
The fabled quinary or 5th order rainbow is made by sunlight reflected five times inside raindrops. Now, for the first time, we have an image of one.
October 20, 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 planet found by the Kepler spacecraft.
October 16, 2014
Earth’s last magnetic reversal took less than 100 years
A study demonstrates that Earth's last magnetic reversal - 786,000 years ago - happened in roughly the span of a human lifetime.
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
San Francisco Bay area overdue for a big quake
Four urban sections of the San Andreas Fault system in Northern California have stored enough energy to produce major earthquakes, according to a new study.
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
