Science Chapter 8 I

radiation consisting of electromagnetic waves, including radio waves, infrared, visible light, ultraviolet, x-rays, and gamma rays.

A telescope which uses a lens to collect light

A telescope which uses a curved mirror to collect light

• -A celestial body that orbits a planet; a moon.
• -An object launched to orbit Earth or another celestial body

Something that orbits, especially a spacecraft that orbits a planet or moon without landing on it.

A hypothesis concerning the origin of the solar system according to which a rotating nebula cooled and contracted, throwing off rings of matter that contracted into the planets and their moons, while the great mass of the condensing nebula became the sun.

A self-luminous celestial body consisting of a mass of gas held together by its own gravity in which the energy generated by nuclear reactions in the interior is balanced by the outflow of energy to the surface, and the inward-directed gravitational forces are balanced by the outward-directed gas and radiation pressures.

A diffuse mass of interstellar dust or gas or both, visible as luminous patches or areas of darkness depending on the way the mass absorbs or reflects incident radiation.

a cloud of interstellar gas and dust that gradually collapses, forming a hot dense core, and evolves into a star once nuclear fusion can occur in the core

a reaction in which two nuclei combine to form a nucleus with the release of energy

The visible outer layer of a star, especially of the sun.

• Any of the relatively cool dark spots appearing periodically in groups
• on the surface of the sun that are associated with strong magnetic
• fields.

A stream of high-speed, ionized particles ejected primarily from the sun's corona.

• A sudden eruption of magnetic energy released on or near the surface of the sun, usually associated with sunspots and accompanied by bursts of electromagnetic radiation and particles. Ultraviolet and x-ray radiation from solar flares often induce electromagnetic disturbances in the earth's atmosphere

Without it we die

a measure of the radiant power emitted by a star

the magnitude that a star would have if it were viewed from a distance of 10 parsecs (32.62 light years) from the earth

An instrument for producing and observing spectra.

An isolated bright or dark line in a spectrum produced by emission or absorption of light of a single wavelength.