Ask the Chatbot Games & Quizzes History & Society Science & Tech Biographies Animals & Nature Geography & Travel Arts & Culture Money Videos
disk
Directory
References
Images
Images taken with the Hubble Space Telescope of four protoplanetary disks around young stars in the Orion Nebula. NGC 5866 An accretion disk that might be producing planets around a young star named HD 141569A, in an image taken by the Hubble Space Telescope. The star lies some 320 light-years from Earth. The photograph has been modified to simulate what the disk would look like if viewed from above, and false colours were added to better show the disk's structure. To reveal the disk, the star's light was blocked out, so a black central region appears in place of the star. A nearby double-star system appears at upper left.
Discover
The Colosseum, Rome, Italy. Giant amphitheatre built in Rome under the Flavian emperors. (ancient architecture; architectural ruins)
New Seven Wonders of the World
Black widow spider
9 of the World’s Deadliest Spiders
Snowshoe hare (Lepus americanus) with its Summer coat on the left side and its winter coat on the right.
7 Animals That Turn White in Winter
Aphrodite. Greek mythology. Sculpture. Aphrodite is the Greek goddess of love and beauty.
12 Greek Gods and Goddesses
Statue of Nostradamus
Nostradamus and His Prophecies
American bison (Bison bison) also known as buffalo or plains buffalo on the prairie, western U.S.
What’s the Difference Between Bison and Buffalo?
Close up of books. Stack of books, pile of books, literature, reading. Homepage 2010, arts and entertainment, history and society
12 Novels Considered the “Greatest Book Ever Written”

disk

galactic
Also known as: disk component

Learn about this topic in these articles:

galactic structure

  • Milky Way Galaxy
    In Milky Way Galaxy: The disk

    From a distance the most conspicuous part of the Galaxy would be the disk, which extends from the nucleus out to approximately 75,000 light-years. The Galaxy resembles other spiral systems, featuring as it does a bright, flat arrangement of stars and gas clouds that…

    Read More
  • Whirlpool Galaxy (M51); NGC 5195
    In galaxy: The disk component

    Except for such early-type galaxies as S0, SB0, Sa, and SBa systems, spirals and irregulars have a flat component of stars that emits most of their brightness. The disk component has a thickness that is approximately one-fifth its diameter (this varies, depending on…

    Read More