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...

In the 2000s, most echo effects units used electronic or digital circuitry to recreate the echo effect.[citation needed] Light echo ἠχώ, Henry George Liddell...

000 light years (10 kpc). Rapidly brightening objects like novae and supernovae are known to produce a phenomenon known as light echo. The light that...

Project Echo was the first passive communications satellite experiment. Each of the two American spacecraft, launched in 1960 and 1964, were metalized...

shock breakout. The infrared echo is accompanied by a scattered light echo. The recorded spectrum of the optical light echo proved the supernova was of...

000 K cooler than expected from other supernova impostor events. Further light echo observations show that following the peak brightness of the Great Eruption...

Amazon Echo, often shortened to Echo, is an American brand of smart speakers developed by Amazon. Echo devices connect to the voice-controlled intelligent...

Echo Park is a neighborhood in the east-central region of Los Angeles, California. Located to the northwest of Downtown, it is bordered by Silver Lake...

Hubble Space Telescope image of the expanding light echo around the star V838 Mon, which is more than 19,000 light-years away from Earth. Another conspiracy...

supergiants are 7.7 ± 1.7 Mpc and 9.6 ± 2.2 Mpc. Ben Sugerman found a "light echo" – a later reflection of the explosion – associated with SN 2003gd. This...