Goldstone radar observations on 2011 August 19 and 20 detected echoes from the nucleus and coma.

Condensation occurs and radar detects echoes above the ground (colored areas).

These instruments, he writes, can produce once again "the sort of awe that radio astronomers must feel when they detect echoes of the original 'big bang' still reverberating through the universe."

How could either have failed to detect echoes of the past in meetings between White House staff and representatives of investigating agencies?

Perhaps the bat detects echoes not with its ears but with sensitive regions close to the ears, the functioning of which was impaired when the bat's ears were plugged.

Using this device Fessenden was able to detect icebergs at a distance of about 2 miles, and occasionally detected echoes from the sea floor.

In his 1960 study of Sullivan's music Gervase Hughes also detects echoes of Schumann, and of Schubert as well.

Critic Dave Marsh of Rolling Stone Magazine detected echoes in the song of the "manic verve" of The Beatles' song "Birthday".

So familiar that Mr. Hunter detects echoes of his characters in other works.

Then a UNSA team erecting an optical observatory on the Lunar Farside detected unusual echoes on ultrasonics from about two hundred feet below the surface.