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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.