Facebook introduces hashtags

Facebook is introducing hashtags, the number signs used on Twitter, Instagram and other services to identify topics being discussed and allow users to search for them.

Philippine development sparks 'sunset' protest

Hundreds of Filipinos converged on the Philippine capital's main bayfront Tuesday for a unique "sunset watch" protest aimed at stopping what they said would be a disastrous reclamation project.

Extremely rare transit of Venus to occur on June 5, 2012

A few hours before sunset on June 5th, 2012 residents of the Washington, DC metropolitan area will have a chance to witness one of the rarest celestial phenomena known: a “Transit of Venus”.

Venus invades the Pleiades

This week the second planet from the sun will pass directly in front of the Pleiades star cluster. It's a rare sunset conjunction that's easy to find with the unaided eye, but best seen through binoculars or a small telescope.

Image: Sunset over South America

(PhysOrg.com) -- The Expedition 27 crew photographed this sunset over western South America from aboard the International Space Station.

See Mercury at sunset

The timing couldn't be better. Just as NASA's MESSENGER probe is about to enter orbit around Mercury, the innermost planet is popping out of the twilight for its best apparition of 2011.

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