Author Question: Our most detailed maps of Venus come from A) direct observation from Earth-based optical ... (Read 76 times)

Pineappleeh · **on:** Jul 27, 2018

Our most detailed maps of Venus come from

A) direct observation from Earth-based optical telescopes.
B) Earth-based radio telescopes.
C) the Hubble Space Telescope.
D) manned landings.
E) the Magellan space probe.

Question 2

Two stars both have parallaxes of 0.023, but star A has apparent magnitude +2.3, while star B is magnitude +7.3. Which statement is true?

A) Star B must be ten times more luminous.
B) Star A is both 100 brighter and larger than star B.
C) Star A is both 100 brighter and more luminous than star B.
D) Star A must be ten times closer.
E) Nothing, since we do not know their absolute magnitudes.