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'Blood Moons' Explained: What Causes a Lunar Eclipse Tetrad? (Infographic)

by Karl Tate , SPACE.com Infographics Artist   |   September 18, 2015 09:29am ET Editor’s note: To find out more about the rare supermoon lunar eclipse of Sept. 27-28 and how to see it, visit: Supermoon Lunar Eclipse 2015: Full ‘Blood Moon’ Coverage . Such an event won’t happen again until 2033. The word “eclipse” means to obscure. When […]

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What Is the Big Bang Theory?

A 2013 map of the background radiation left over from the Big Bang, taken by the ESA’s Planck spacecraft, captured the oldest light in the universe. This information helps astronomers determine the age of the universe.Credit: ESA and the Planck Collaboration. The Big Bang Theory is the leading explanation about how the universe began. At […]

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Photos: Dwarf Planet Ceres, the Solar System's Largest Asteroid

The dwarf planet Ceres, the largest asteroid in the solar system, is round and may contain more fresh water than the entire Earth. NASA’s Dawn spacecraft has been exploring Ceres since 2015. See more views of Ceres in this SPACE.com gallery. HERE:This image of Ceres as seen by NASA’s Dawn spacecraft shows how the dwarf […]

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India's First Mars Mission in Pictures (Gallery)

<div data-cycle-pager-template=”” readability=”31.5″> Aurorae Choas Credit: ISRO Aurorae Chaos, Pyrrhae Chaos and other regions of Mars captured by the Mars Orbiter camera. <div data-cycle-pager-template=”” readability=”31″> Valles Marineris Credit: ISRO Canyon walls clearly show in this image of Valles Marineris. <div data-cycle-pager-template=”” readability=”31″> Valles Marineris – Large Canyon Credit: ISRO Valles Marineris is the largest canyon […]

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Main Sequence Stars: Definition & Life Cycle

by Nola Taylor Redd, SPACE.com Contributor   |   May 05, 2015 11:02pm ET This Hubble Space Telescope image shows Sirius A, the brightest star in our nighttime sky, along with its faint, tiny stellar companion, Sirius B. Astronomers overexposed the image of Sirius A so that the dim Sirius B (tiny dot at lower left) could […]

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Watch Live @ 9 pm ET: Slooh Earth Day Webcast

The Slooh community observatory will be celebrating Earth Day on Saturday (April 22), with a webcast beginning at 9 a.m. EDT (1300 GMT). During the webcast, members of the public will share the things they’d miss most about Earth if they had to go to space, while two astronauts will name the things they did […]

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Space, astronomy and science