What is the smallest of the Galilean moons? Why is it then the brightest?
What will be an ideal response?
Europa has a very young, bright ice crust that reflects light well.
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What key process underlies why Mars changed so much from its early conditions to its conditions today?
a. Outgassing. b. Interior cooling. c. Slowing of its rotation rate. d. Evaporation of its ocean.
Newly-formed neutron stars start with weak magnetic fields, but they strengthen over time into pulsars
Indicate whether the statement is true or false
The__________estimates the total number of communicative civilizations in our galaxy
A) Copernicus scale B) Drake equation C) Kardashev scale D) Kepler equation
Condensation in the solar nebula probably led to the formation of
a. icy grains beyond the present orbit of Jupiter. b. metallic grains near the present orbit of Mercury. c. silicate grains near the present orbit of Earth. d. all of the above e. none of the above