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  1. nasa.gov
    https://imagine.gsfc.nasa.gov › hst_bday

    Hubble Birthday - Imagine the Universe!

    Discover what the Hubble Space Telescope captured on your birthday by selecting your birth date and exploring stunning images of the universe.

  2. nasa.gov
    https://imagine.gsfc.nasa.gov › hst_bday

    Carina Nebula Pillars - Imagine the Universe!

    Check out what the @NASAHubble Space Telescope looked at on my birthday!

  3. nasa.gov
    https://imagine.gsfc.nasa.gov › observatories › learning › globalastro › …
    [PDF]

    Building the Coolest X-ray Satellite

    In an optical telescope such as the Hubble Space Telescope, the light rays strike the reflector surface at or near 90 degrees from the surface; this is called normal incidence reflection.