... At the top of Hawaii 's Mauna Kea are some of the largest opticaltelescopes on Earth, including the Keck telescopes , Gemini , Subaru , CFHT , and the IRTF . ...
... Some 200,000 light-years distant in the constellation Tucana, the small irregular galaxy's stars, gas, and dust that lie along a bar and extended "wing", are familiar in images from opticaltelescopes . ...
... Powered by a massive black hole, the quasar suddenly turned off , leaving only galaxy and glowing voorwerp visible in telescopes at optical wavelengths. ...
... in modern times to have a small companion star, Sirius B. Sirius B is much dimmer and appears so close to the brilliant Sirius A that it was not actually sighted until 1862, during Alvan Clark's testing of a large, well made optical refracting telescope ...
... The scenario is supported by x-ray data from the Chandra Observatory combined with a Hubble Space Telescopeoptical image in this false-color composite picture. ...
... In this close-up view , the central dark lane of absorbing interstellar dust stands out in silhouette against the hydrogen glow and actually hides the true source of the Flame Nebula's energy from opticaltelescopes. ...