Unless otherwise noted, all images and animations are generally not copyrighted.
You may use NASA imagery, video and audio material for educational or informational purposes, including photo collections, textbooks, public exhibits, and Internet web pages..
NASA MODIS Image of the Day: July 23, 2007 – Dust Plume Over Iraq and Iran.
A dust plume blew along the Iraq-Iran border on July 18, 2007.
The MODIS flying on NASA's Terra satellite took this picture the same day..
On June 16, 1995, when the World Wide Web was young, two gamma-ray astronomers at NASA's Goddard Space Flight Center in Greenbelt, Maryland, launched a website with a simple aim – to post a daily astronomical image along with a brief, easily understood explanation..
2012 August 24: Moon Meets Morning Star 2012 August 23: Conjunction Colours 2012 August 22: Clouds Near the Edge of Space 2012 August 21: DNA: The Molecule that Defines You 2012 August 20: A Filament Across the Sun 2012 August 19: M72: A Globular Cluster of Stars 2012 August 18: Curiosity on Mars: Still Life with Rover
\nThis is a list of supernova candidates
Or stars that astronomers have suggested are supernova progenitors.Type II supernova progenitors include
Stars with at least 10 solar masses that are in the final stages of their evolution.Prominent examples of stars in this mass range include
And members of the Quintuplet Cluster.Type Ia supernova progenitors are white dwarf stars that are close to the Chandrasekhar limit of about 1.44 solar masses and are accreting matter from a binary companion star.The list includes
Massive Wolf–Rayet stars
Which may become Type Ib/Ic supernovae.
