Tuesday's total solar eclipse will be streamed live at 8 p.m. on NASA TV.
The period of total eclipse, called totality, will occur from 8:38 to 8:42 p.m. A total solar eclipse is when the moon comes between the sun and the Earth and casts the darkest part of its shadow – the umbra – on Earth. During a total eclipse, the moon covers the sun completely. In partial and annular solar eclipses, the sun is only partly blocked by the moon.
At 1 p.m. Tuesday, solar scientists from NASA's Goddard Space Flight Center in Greenbelt, Maryland, will participate in aReddit Ask Me Anything.
Twitter, Google+ and Facebook users will be able to join the conversation and ask questions using the hashtag #eclipse2016. The NASA Twitter account for the eclipse is@NASASunEarth.
People also will be able to tag and share their images of the solar eclipse on the NASA Flickr group at: https://www.flickr.com/groups/eclipse2016/.
Tuesday's total solar eclipse will be the only total eclipse of the sun in 2016. The last one occurred in March 2015. The eclipse, which will shadow Indonesia and the North Pacific Ocean, will coincide with a 100-foot-wide asteroid streaking past Earth.
Scientists from NASA's Center for Near-Earth Object Studies at the Jet Propulsion Laboratory in Pasadena, California, project the small asteroid should pass by Earth at a distance of around 3 million miles. There is still a chance it could pass closer, "but certainly no closer than 15,000 miles (24,000 kilometers) above Earth's surface," NASA said in a statement late last month.
The total eclipse will be visible from parts of Indonesia and other locations in the Pacific Ocean. The partial eclipse will be visible in parts of Alaska, Australia, South Asia and East Asia.---- source.