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an image of a spiral galaxy in the night sky
NGC 4102 lies in the northern constellation of Ursa Major (The Great Bear). It contains what is known as a LINER, or low-ionization nuclear emission-line region, meaning that its nucleus emits particular types of radiation — specifically, emission from weakly-ionized or neutral atoms of certain elements. Even in this sense, NGC 4102 is not special; around one third of all nearby galaxies are thought to be LINER galaxies.
an image of a planetary object in the sky with stars around it and a bright blue center
Helix Planetary Nebula
Helix Nebula
an orange and blue star surrounded by stars
NASA Releases Eight Stunning Never-Before-Seen Images of the Cosmos
A region of glowing gas in the Sagittarius arm of the Milky Way galaxy, NGC 3576 is located about 9,000 light years from Earth. Such nebulas present a tableau of the dramatic evolution of massive stars, from formation in vast dark clouds, their relatively brief (a few million years) lives, and the eventual destruction in supernova explosions.
an image of a colorful star in the sky, with text that reads i truly incredible view of the serenity nebula
A nebula is an interstellar cloud of dust, hydrogen, helium and other ionized gases. Originally, nebula was a name for any diffuse astronomical object, including galaxies beyond the Milky Way. The Andromeda Galaxy, for instance, was referred to as the Andromeda Nebula before the true nature of galaxies was confirmed in the early 20th century by Vesto Slipher, Edwin Hubble, et al. Nebulae are often star-forming regions, such as in the Eagle Nebula.
the andromidus galaxy with stars in the background
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