Kepler's third law relates the square of the planet's orbital period in years to the cube of its average distance from the Sun in astronomical units
Indicate whether the statement is true or false
TRUE
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The form of electromagnetic radiation most effectively blocked by a dark nebulae is ________
Fill in the blank(s) with correct word
Why are Cepheid variables important?
A) Cepheid variables are stars that vary in brightness because they harbor a black hole. Therefore, they provide direct evidence for black holes. B) Cepheids variables are supermassive stars that are on the verge of becoming supernovae. Therefore they allow us to choose candidates to watch if we hope to observe a supernova. C) Cepheids variables are a type of irregular galaxy, much more common in the early universe. Therefore they help to understand how galaxies formed. D) Cepheids variables are pulsating stars whose pulsation periods are directly related to their true luminosities. Therefore they can be used as distance indicators.
The entropy of a system measures its:
a. organization – disordered systems have low entropy. b. organization – disordered systems have high entropy. c. energy – low energy systems have low entropy. d. energy – low energy systems have high entropy. e. temperature – high temperature systems have low entropy.
The Earth's magnetic field is attributed to the
A) flow of molten liquid in Earth's inner core. B) flow of molten fluid in Earth's outer core. C) movement of lithospheric plates in the outer mantle. D) movement of lithospheric plates at Earth's surface.