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Coincidence that sun and moon seem same size?
The sun and moon appear the same size in Earth's sky because the sun's diameter is about 400 times greater - but the sun is also about 400 times farther away.
June 26, 2013
Ten thousandth near-Earth object discovered
More than 10,000 asteroids and comets that can pass near Earth have now been discovered. The 10,000th near-Earth object, asteroid 2013 MZ5, was first detected on the night of June 18, 2013.
June 25, 2013
One star, three habitable planets
A team of astronomers has combined new observations with existing data to reveal a solar system packed full of planets.
June 25, 2013
Video: Meet ALMA, a revolutionary new telescope
The ALMA telescope, high in the northern Chilean desert, was officially inaugurated this spring. EarthSky was there. Check out our video!
June 24, 2013
See a supermoon! Awesome photos of the June 2013 supermoon
Thank you for your photos! They're awesome!
June 23, 2013
Hubble spots galaxies in close encounter
The NASA/ESA Hubble Space Telescope has produced this vivid image of a pair of interacting galaxies known as Arp 142.
June 20, 2013
Explore Mars surface yourself: Pan and zoom new billion-pixel view
NASA's Mars rover Curiosity offers armchair explorers the next best thing to being there.
June 19, 2013
The fast winds of Venus are getting faster
Since the 1960s, we've known the winds of Venus "super-rotate," or blow faster than the planet rotates. Now a spacecraft has found Venus' winds are speeding up.
June 18, 2013
Got something to say to an alien? Lone Signal can beam your message
Their new website launched today, so you can be among the first to compose a message to a distant civilization.
June 18, 2013
Cells play tag to determine direction of movement
Researchers have found that cells in our bodies carry out something similar to a game of tag to coordinate their movement in a particular direction.
June 17, 2013
