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2000-2009 Launch Schedule

Dive into the new millennium of spaceflight with our complete 2000-2009 Rocket Launch Schedule. This comprehensive guide details every mission from a decade defined by the rapid assembly of the…

On This Day in Space History

…you are tracking a specific mission anniversary or honoring the pioneers of the Final Frontier, our comprehensive daily guide connects you with the cosmic events that happened on this very…

The Observable Universe

…the observable universe. In light, the farthest we can see comes from the cosmic microwave background, a time 13.8 billion years ago when the universe was opaque like thick fog….

Pleiades over Half Dome

Copyright: Dheera Venkatraman Stars come in bunches. The most famous bunch of stars on the sky is the Pleiades, a bright cluster that can be easily seen with the unaided…

Hickson 44 in Leo

Copyright: Jiang Wu Scanning the skies for galaxies, Canadian astronomer Paul Hickson and colleagues identified some 100 compact groups of galaxies, now appropriately called Hickson Compact Groups. The four prominent…

A Double Detonation Supernova

…In this two-star system, gravity causes the larger and fluffier star to give up mass to a smaller and denser white dwarf companion. Eventually the white dwarf’s near-surface temperature goes…

A Helix Nebula Deep Field

…because it also appears that you are looking down the axis of a helix. In actuality, it is now understood to have a surprisingly complex geometry, including radial filaments and…

Milky Way and Exploding Meteor

…entry into Earth’s atmosphere. These grains were shed from Comet Swift-Tuttle. The Perseids result from the annual crossing of the Earth through Comet Swift-Tuttle’s orbit, and are typically the most…

Fishing for the Moon

Copyright: How big is planet Earth’s Moon How big is planet Earth’s Moon? Compared to other moons of the Solar System, it’s number 5 on the largest to smallest ranked…

3I/ATLAS: A View from Planet Earth

Copyright: Rolando Ligustri Now outbound after its perihelion or closest approach to the Sun on October 29, Comet 3I/ATLAS is only the third known interstellar object to pass through our…

3I/ATLAS Flyby

…the night of December 15. Though faint, colors emphasized in the image data, show off the comet’s yellowish dust tail and bluish ion tail along with a greenish tinged coma….

Orion’s Cradle

Copyright: Piotr Czerski Cradled in red-glowing hydrogen gas, stars are being born in Orion. These stellar nurseries lie at the edge of the giant Orion molecular cloud complex, some 1,500…