person who takes part in space flights.
layers of gases surrounding a planet or other celestial body.
teardrop-shaped area, with the flat area facing the sun, around the Earth controlled by the Earth's magnetic field.
loss of electricity.
energy, emitted as waves or particles, radiating outward from a source.
flow of charged particles, mainly protons and electrons, from the sun to the edge of the solar system.
vehicle designed for travel outside Earth's atmosphere.
changes in the environment outside the Earth's atmosphere, usually influenced by the sun.