• A major figure at Mount Stromlo Observatory, Gascoigne helped it develop from a solar observatory to a centre of stellar and galactic research, and was instrumental in the creation of its field observatory in northern New South Wales, Siding Spring Observatory.
  • Wikipedia: Ben Gascoigne
  • Accretion, the falling of dust or gaseous matter onto stellar or supermassive black holes, is thought to be responsible for some spectacularly luminous astronomical objects, notably diverse kinds of active galactic nuclei on galactic scales and stellar-size objects such as microquasars.
  • Wikipedia: General relativity
  • Across the galaxy, it is found that the amount of heavy elements in H II regions decreases with increasing distance from the galactic centre.
  • Wikipedia: H II region
  • Because of the flattened shape of the Milky Way Galaxy, sources within our own galaxy would be strongly concentrated in or near the galactic plane.
  • Wikipedia: Gamma-ray burst
  • Evidence shows that the Sun passed through the plane bisecting the galactic disc only three million years ago and is now moving farther above it.
  • Wikipedia: 2012 phenomenon
  • Given its motion, a corresponding projection back in time would take Betelgeuse around 290 parsecs farther from the galactic plane—an implausible location, as there is no star formation region there.
  • Wikipedia: Betelgeuse
  • He contends that more comets are arriving in the inner Solar System from a particular region of the Oort Cloud than can be explained by the galactic tide or stellar perturbations alone, and that the most likely cause is a Jupiter-mass object in a distant orbit.
  • Wikipedia: Oort cloud
  • In all, the HDF is thought to contain fewer than twenty galactic foreground stars; by far the majority of objects in the field are distant galaxies.
  • Wikipedia: Hubble Deep Field
  • In denser regions such as the core of globular clusters or the galactic center, collisions can be more common.
  • Wikipedia: Star
  • M36 (NGC 1960) is a young galactic open cluster with approximately 60 stars, most of which are relatively bright; however, only about 40 stars are visible in most amateur instruments.
  • Wikipedia: Auriga (constellation)
  • Metallicity, the proportion of stellar mass made up of elements heavier than helium, helps classify stars relative to the galactic population.
  • Wikipedia: Barnard's Star
  • Neutrinos are particles that are produced in great quantities by a supernova explosion, and they are not significantly absorbed by the interstellar gas and dust of the galactic disk.
  • Wikipedia: Supernova
  • The constellation of Andromeda lies well away from the galactic plane, so it does not contain any of the open clusters or bright nebulae of the Milky Way.
  • Wikipedia: Andromeda (constellation)
  • The distribution of hot gas in galactic clusters can be mapped by X-rays.
  • Wikipedia: Galaxy
  • The general direction of the Sun's galactic motion is towards the star Vega in the constellation of Lyra at an angle of roughly 60 sky degrees to the direction of the Galactic Center.
  • Wikipedia: Sun
  • The immediate galactic neighbourhood of the Solar System is known as the Local Interstellar Cloud or Local Fluff, an area of denser cloud in an otherwise sparse region known as the Local Bubble, an hourglass-shaped cavity in the interstellar medium roughly 300 light years across.
  • Wikipedia: Solar System
  • The position of the burst's afterglow was measurably offset from the centroid of the host galaxy, effectively ruling out the possibility that the burst originated in an active galactic nucleus.
  • Wikipedia: GRB 970228
  • The redshift of GRB 970508's optical afterglow, z = 0.835, agreed with the host galaxy's redshift of z = 0.83, suggesting that, unlike previously observed bursts, GRB 970508 may have been associated with an active galactic nucleus.
  • Wikipedia: GRB 970508
  • They are found mostly near the plane of the Milky Way, with the greatest concentration near the galactic center.
  • Wikipedia: Planetary nebula
  • Tidal interactions have stripped away much of the mass from Palomar 5, and further interactions as it passes through the galactic core are expected to transform it into a long stream of stars orbiting the Milky Way halo.
  • Wikipedia: Globular cluster
  • With a galactic latitude of 4 degrees and galactic longitude 71 degrees, this system lies inward along the same Orion Spur in which the Sun is located within the Milky Way, near where the spur approaches the Sagittarius Arm.
  • Wikipedia: Cygnus X-1