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Hubble radius, Hubble sphere (not to be confused with a Hubble bubble), Hubble volume, or Hubble horizon is a conceptual horizon defining the boundary between particles that are moving slower and faster than the speed of light relative to an observer at one given time. Note that this does not mean the particle is unobservable; the light from ...
The anthropic principle, also known as the observation selection effect, is the proposition that the range of possible observations that could be made about the universe is limited by the fact that observations are possible only in the type of universe that is capable of developing intelligent life. Proponents of the anthropic principle argue ...
The Hubble Space Telescope (HST or Hubble) is a space telescope that was launched into low Earth orbit in 1990 and remains in operation. It was not the first space telescope, but it is one of the largest and most versatile, renowned as a vital research tool and as a public relations boon for astronomy.
Larger, ground-based telescopes have only recently matched Hubble in resolution for near-infrared wavelengths of faint objects. Being above the atmosphere eliminates the problem of airglow, allowing Hubble to make observations of ultrafaint objects. Ground-based telescopes cannot compensate for airglow on ultrafaint objects, and so very faint ...
Wavelength sensitivity of Hubble, Webb, Roman, and other major observatories The Hubble Space Telescope, one of the Great Observatories. A space telescope (also known as space observatory) is a telescope in outer space used to observe astronomical objects.
Hubble, with its sharp imaging capabilities, detected more than 200 million stars in the Andromeda galaxy that are brighter than Earth's sun. But astronomers estimate the total population of stars ...
The Hubble Space Telescope is known for its dazzling images of cosmic phenomena, but it didn't exactly start that way. Its first ever image , captured 25 years ago today, is decidedly less exciting.
The Hubble Space Telescope has temporarily stopped observing the cosmos. NASA said the telescope slipped into a hibernating state more than a week ago when one of its three remaining gyroscopes ...