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A light echo is a physical phenomenon caused by light reflected off surfaces distant from the source, and arriving at the observer with a delay relative to this distance. The phenomenon is analogous to an echo of sound, but due to the much faster speed of light, it mostly manifests itself only over astronomical distances.
Project Echo was the first passive communications satellite experiment. ... The concept of using orbital satellites to relay communications predated space travel, ...
Light from the accretion disk around a supermassive black hole is scattered off the surrounding broad line region, causing a delayed echo at redder wavelengths. Reverberation mapping (or Echo mapping ) is an astrophysical technique for measuring the structure of the broad-line region (BLR) around a supermassive black hole at the center of an ...
Raw CMBR data, even from space vehicles such as WMAP or Planck, contain foreground effects that completely obscure the fine-scale structure of the cosmic microwave background. The fine-scale structure is superimposed on the raw CMBR data but is too small to be seen at the scale of the raw data.
The Exoplanet Characterisation Observatory (EChO) was a proposed space telescope [2] as part of the Cosmic Vision roadmap of the European Space Agency, and competed with four other missions for the M3 slot in the programme. On 19 February 2014 the PLATO mission was selected in place of the other candidates in the programme, including EChO. [4]
Hanny's Voorwerp (HsV) is about the size of a small galaxy and has a central hole over 16,000 light years across. In an image taken with the Hubble Space Telescope, HsV is colored green, a standard false color that is used to represent the presence of several luminous emission lines of glowing oxygen.
A former NASA commander has revealed that while piloting his private plane in Texas last summer he nearly had a collision with two mysterious “metallic, spherical orbs.” Astronaut Leroy Chiao ...
The Roland Space Echo is a line of tape delay units introduced by Roland Corporation in 1974. Whereas prior tape delay effects used tape reels, the Space Echo uses a free-running tape transport system. This reduces tape wear, noise, and wow and flutter, and made the units more reliable and easy to transport.