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.

Technology - Internet

Jun 12, 2013 1 / 5 (2) 0

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.

Space & Earth - Environment

Feb 12, 2013 not rated yet 0

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”.

Space & Earth - Astronomy

May 23, 2012 5 / 5 (5) 1

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 ...

Space & Earth - Space Exploration

Apr 03, 2012 5 / 5 (4) 1 |

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

Space & Earth - Space Exploration

May 09, 2011 4 / 5 (3) 0

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.

Space & Earth - Space Exploration

Mar 15, 2011 5 / 5 (6) 0 |

(PhysOrg.com) -- A new Mars movie clip gives us a rover's-eye view of a bluish Martian sunset, while another clip shows the silhouette of the moon Phobos passing in front of the sun.

Space & Earth - Space Exploration

Dec 23, 2010 4.8 / 5 (13) 18 |

Despite the fact that bats are active after sunset, they rely on the sun as their most trusted source of navigation. Researchers from the Max Planck Institute for Ornithology found that the greater mouse-eared ...

Biology - Plants & Animals

Mar 29, 2010 not rated yet 0 |

(AP) -- Mercury, the solar system's most elusive planet, will be easier to see for the next two weeks.

Space & Earth - Space Exploration

Mar 29, 2010 5 / 5 (1) 0

(AP) -- Watch the sunset, save a life.

Technology - Other

Feb 04, 2010 4.7 / 5 (3) 0

(PhysOrg.com) -- It's time once again for nature to put on its late-summer fireworks show: the Perseid meteor shower. This year's best viewing will be before dawn on Aug. 12, with a second chance after sunset ...

Space & Earth - Space Exploration

Aug 07, 2009 4 / 5 (4) 3

(PhysOrg.com) -- Are wind turbines dangerous to billions of migrating birds?

Biology - Plants & Animals

Jun 24, 2009 3 / 5 (2) 1