1. The Milky Way galaxy is an example of a(n) ______________ source of radio emissions.
2. A single star is a _________________ discrete source.
3. Stars that show significant changes in brightness over short periods are called ________________ stars.
4. Cepheids with longer periods are always ____________ luminous than those with shorter periods.
5. It is believed that pulsars are rapidly spinning _____________ stars.
6. The strongest source of radio emissions that we experience on Earth is the __________.
7. Solar flares, associated with groups of sun spots, emit short bursts of ___________ ______________.
1. extended 2. localized 3. variable 4. more 5. neutron 6. sun 7. radio energy (or radio emissions)
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