Sights worldwide went dark for one hour to commemorate Earth Hour, an annual event by the World Wildlife Fund (WWF) to raise awareness of environmental issues and climate change.
Sights worldwide went dark for one hour to commemorate Earth Hour, an annual event by the World Wildlife Fund (WWF) to raise awareness of environmental issues and climate change.
In celebration of the 34th anniversary of the launch of NASA's legendary Hubble Space Telescope on April 24, astronomers took a..