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| | The Female Bird Song Project | | | There's a false notion that female birdsong is rare in comparison to male birdsong. But lady birds sing, too. You can participate in a new project that aims to collect more recordings of female birds. | | | | 'Lost' asteroid to pass closely May 15 | | | Asteroid 2010 WC9 will pass at about half the moon's distance, in one of the closest approaches ever observed of an asteroid of this size. Click in for information about viewing online. | | | | Fly over a Mars crater | | | Fly over Mars' Neukum Crater, in this 3-minute video based on images taken by ESA’s Mars Express spacecraft. | | | | Find the Keystone in Hercules | | | The Keystone is a noticeable pattern of 4 stars in the constellation Hercules. The bright star Vega acts as your guide to finding it. | | | | | |
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| The EarthSky Store | | Help us keep presenting your world, and cosmos, to you. Plus get some cool astronomy swag while doing so! | | | | | |
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|  | | | Find the Keystone in Hercules | | The Keystone, in turn, is your ticket to finding a famous globular star cluster in Hercules, otherwise known as the Great Cluster in Hercules, aka Messier 13 or M13. | | | | | |
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 | | | Galaxies look like fireflies | | In the darkness of the distant universe, galaxies resemble glowing fireflies or flickering candles. This Hubble Space Telescope image shows a massive group of galaxies bound together by gravity: a cluster named RXC J0032.1+1808. | | |
