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.
What happens during the fission of uranium? Fission happens when an unstable nucleus breaks apart, creating two nuclei, each with very roughly half of the mass of the original. Fission can result from the atom having a â¦neutron collide with it, or it can happen spontaneously.