Definition of asthenosphere : a zone of a celestial body (such as the earth) which lies beneath the lithosphere and within which the material is believed to yield readily to persistent stresses asthenospheric
Fraser: Right. Pamela: And so any time you hear a noise in space, if you hear explosions, thatâs probably your own spacecraft, and the noise is transferring through the hull and through the air in your spacecraft. Other than that, youâre not going to hear explosions.
The remnant of a supernova explosion is a glowing filamentary nebula of, generally, symmetric shape. In a supernova explosion a star ejects a substantial part of its mass (about 1 solar mass) at a speed of about 10,000 km/sec. The resulting spherically symmetric shock wave travels through the interstellar gas.