The cosmic explosion that is hypothesized to have marked the origin of the universe (B.B.)
Minus 273.15 degrees Celsius (A.Z.)
A region of space having a gravitational field so intense that no matter or radiation can escape (B.H.)
The energy an object possesses by virtue of its motion (K.E.)
A process in which atoms and molecules recombine by forming or breaking chemical bonds (C.R.)
The uppermost layer of Earth (C.C.)
A boundary around a black hole beyond which no light or other radiation can escape (E.H.)
A beam of particles (electrons) emitted from the negative terminal in a vacuum tube (C.R.)
The number of protons in an atomic nucleus (A.N.)
Big bang
Absolute zero
Black hole
Kinetic energy
Chemical reaction
Continental crust
Event horizon
Cathode ray
Atomic number
Weekend on 07/14/2016