The four states of matter are __________, __________, __________, and __________
Fill in the blank(s) with correct word
solid, liquid, gas, plasma
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____________________ is a measure of the light energy that hits one square meter in one second
Fill in the blank(s) with correct word
Each Voyager spacecraft carries a "postcard" designed to be understandable to any aliens that might someday encounter it. On the "postcard," scientists pinpointed the location of Earth by triangulating it between pulsars
Why did the scientists choose pulsars rather than some other type of star? A) Pulsars are very bright and therefore easy to find. B) Several pulsars are located within a dozen light-years of our solar system, making them useful for finding our solar system. C) We're pretty sure that aliens will have only radio telescopes and not optical telescopes, so they'll have a better chance of seeing pulsars than ordinary stars. D) Pulsars are easy to identify by their almost perfectly steady periods of pulsation.
Among discovered meteorites, we have found some with all the following origins except
A) being a fragment from Comet Halley. B) being a fragment from the surface of Mars. C) being a fragment from the surface of the Moon. D) being a fragment of a shattered asteroid.
The Milky Way is often considered to be an intermediately wound, barred spiral, which would be type
A) E4. B) Sa. C) SBb. D) SBV. E) B2S.