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Blogs | Jul 28, 2014

As Comet Siding Spring approaches Mars, NASA gets ready

The icy core of Comet C/2013 A1 Siding Spring won’t strike Mars, but dust from the comet might damage our spacecraft.

Blogs | Jul 28, 2014

Pluto-bound New Horizons update

New Horizons – en route to Pluto – is currently out of hibernation for a series of engineering and navigation checks, which will continue until the end of August 2014.

Science Wire | Jul 27, 2014

Perseid meteor shower kicks off! Fireballs detected this weekend

Earth has just entered the stream of debris left behind by Comet Swift-Tuttle, the parent comet of the Perseids. Now is the time to start watching for meteors.

Meteor seen during 2013 Eta Aquarid shower by Justin Ng
Tonight | Jul 26, 2014

EarthSky’s meteor shower guide for 2014

Don’t wait until August 11, 12 and 13 to watch the Perseids in 2014. The moon will be in the way. Start watching for meteors now!

Artist's concept of Rosetta spacecraft
Science Wire | Jul 26, 2014

As Rosetta approaches its comet, a bright ‘neck’ and hilly terrain

The latest images. Next month, the Rosetta spacecraft will be only 100 kilometers (60 miles) from the comet and will begin traveling alongside it through space.

In this artist's conception, the atmosphere of an Earth-like planet displays a brownish haze - the result of widespread pollution. New research shows that the upcoming James Webb Space Telescope potentially could detect certain pollutants, specifically CFCs, in the atmospheres of Earth-sized planets orbiting white dwarf stars. Image credit: Christine Pulliam (CfA)
Science Wire | Jul 25, 2014

Can we find aliens by looking for their pollution?

Maybe some extra-terrestrials pollute their planets too.

July 24 moon and Venus by Brenda Steffes
Photos | Jul 25, 2014

Beauty! Best photos of July 24 moon and Venus

The sky’s two brightest nighttime objects, in the east before dawn this morning.

Screen Shot 2014-07-25 at 9.10.00 AM
Science Wire | Jul 25, 2014

Video: Joshua Tree nights

Shot in Joshua Tree National Park in California. Relax … and enjoy the night sky.

Perseid meteor
Tonight | Jul 24, 2014

Everything you need to know: Perseid meteor shower

In the N. Hemisphere, the annual August Perseid meteor shower ranks as the year’s favorite shower. A big, bright supermoon interferes in 2014. So start observing the Perseids soon!

Image Credit: NASA, ESA et al.
FAQs | Jul 23, 2014

Will the Andromeda galaxy someday collide with our Milky Way?

The Andromeda galaxy is approaching our Milky Way galaxy across the vastness of space. When will they collide?

Science Wire | Jul 22, 2014

Camelopardalids: Just a few centuries late in catching a good show

Remember the Camelopardalids, the meteor shower earlier this year astronomers said would be spectacular … except it wasn’t? Now, the same astronomers explain why.

Celestial software image of Earth with two moons,.
Science Wire | Jul 22, 2014

Does Earth have a second moon?

Mars has two moons, Jupiter has 67, Saturn 62, Uranus 27, Neptune 14. But our planet Earth has just one moon. Doesn’t it?

Young moon of March 31, 2014 by Ken Christison.
Tonight | Jul 22, 2014

Longest lunar month of 2014 starts on August 25

The longest lunar month of 2014 will start August 25 and end September 24. All you need to know about the varying lengths of the lunar months, here.

Artist's illustration via CfA
Science Wire | Jul 21, 2014

Transiting exoplanet with longest year yet

Most distant planets known so far orbit close to their stars and thus have a short “year.” Kepler-421b has a year about twice as long as Earth’s.

Image Credit: Arenamontanus
Science Wire | Jul 21, 2014

What exactly is twilight?

Twilight is the time of day between daylight and darkness. Astronomers, the experts on nighttime, recognize three kinds of twilight.

Expect high tides around Jan. 1 and 30, 2014
FAQs | Jul 20, 2014

What is a supermoon?

The year 2014 has a total of five supermoons. They are the two new moons of January, and the full moons of July, August and September. Next supermoon: August 10.

Image Credit: NASA
Science Wire | Jul 20, 2014

Best photos of Apollo 11 and first footsteps on moon

Today is the 45th anniversary of humanity’s historic first steps on the moon. “One small step for [a] man, one giant leap for mankind.” The story in pictures.

Via  NASA/JPL/SSI/CICLOPS / Mother Jones
This Date in Science | Jul 19, 2014

This date in science: The day Earth smiled

On July 19, 2013, the Cassini spacecraft acquired a distant image of our home world, as we Earth citizens cast our thoughts spaceward.

Science Wire | Jul 18, 2014

Is our universe a bubble?

The multiverse hypothesis – the idea that there are other universes – can be tested, scientists say.

View larger. | A puncture (center right) in one of the Mars rover Curiosity’s wheels. (The sequence of cutouts at lower right are deliberate and imprint ‘JPL’ in Morse code as the wheels roll across the Martian surface.)  Image via NASA/JPL-CALTECH/MSSS, Nature.
Science Wire | Jul 17, 2014

Mars Curiosity rover now crossing dangerous terrain

The car-sized rover is currently crossing a stretch of hard, rocky ground like that which previously dented and punctured its aluminum wheels.

Photo credit: NASA
This Date in Science | Jul 17, 2014

This date in science: America and Russia meet in space

On July 17, 1975, a famous first handshake between nations in space.