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    The explosive death of a star created this debris cloud, Cassiopeia A, still expanding at shock-wave speeds. This photograph combines an optical image taken by Ken Crawford of the Rancho Del Sol Observatory and X-ray images from NASA's orbiting X-ray telescope NuSTAR, the first telescope to create focused images of high-energy X-rays. Via apod.nasa.gov.

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    The Light That Remains

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    ~~Supernova Remnant Cassiopeia A (NASA, Chandra) ~ for the first time, a multiwavelength three-dimensional (3-D) reconstruction of a supernova remnant has been created. This stunning visualization of Cassiopeia A (Cas A), the result of an explosion approximately 330 years ago by NASA's Marshall Space Flight Center~~

    Globular star cluster Messier 9 (M9) has over 300,000 stars within a diameter of about 90 light-years. It is 25,000 light-years from Earth, near the central bulge of our Milky Way galaxy in the constellation of Sagittarius. Imagine the night sky on a planet orbiting one of these stars!

    The immense Coalsack Nebula is a molecular cloud in the constellation Crux, about 600 light-years away from Earth. Below it in this image is the Dark Doodad Nebula in the constellation Musca. It is about 700 light-years from Earth. Behind it, about 20,000 light-years from Earth, is the globular star cluster NGC 4372.

    NGC 7635 is known simply as The Bubble Nebula, a 10 light-year diameter bubble blown by intense stellar winds from the O-class star above and right of the Bubble's center. That star is several hundred thousand times more luminous and around 45 times more massive than Earth's sun. The Bubble Nebula is 11,000 light-years away toward the constellation Cassiopeia.

    1,300 light years away from Earth in the constellation Cepheus, you will find the picturesque Iris Nebula, cataloged as NGC 7023. The bright blue portion of the nebula is about 6 light years across.

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    The Crab Nebula, also cataloged as M1 and NGC 1952, located about 6,500 light-years from Earth in the constellation Taurus, is the remnant of a supernova blast witnessed on Earth in the year 1054. At its center lies a pulsar - a magnetized neutron star 28-30 kilometers in diameter and spinning 30 times a second!

    The first astronomical object cataloged by Charles Messier, M1 is perhaps better known as the Crab Nebula. It's a supernova remnant; its massive explosion visible to skygazers in the year 1054. At its center is a rapidly rotating pulsar - a neutron star - located about 6,500 light-years from Earth in the constellation Taurus.

    SN 1006, a supernova remnant that lit up Earth's night skies in the year 1006 A.D. Located in the constellation Lupus, it is about 7,000 light-years from Earth.

    NGC 6745 used to be a typical spiral galaxy. But that was hundreds of millions of years ago. Since then it has been interacting with a nearby smaller galaxy (a portion of which is seen in the lower right of this image), contorting its appearance. NGC 6745 spans about 80 thousand light years and is about 200 million light years away from Earth toward the constellation Lyra.

    ♥ Remnant of Supernova

    Over 2 light years across and over 2000 light years away from...

    LL Ori and the Orion Nebula - APOD - NASA

    M51: The Whirlpool Galaxy in Dust and Stars - APOD - NASA

    NGC 7027 is a planetary nebula, a dying star shedding its outer layers on its way to becoming a white dwarf. However, it only started to become a planetary nebula about 600 years ago, giving scientists a glimpse of the early stages of the process. It is located about 3,000 light-years away toward the constellation Cygnus and is visible from a typical background telescope.