Which of the following planets has the least substantial atmosphere?
A) Mercury B) Mars C) Earth D) Neptune E) Venus
Question 2
What do we mean by inflation?
A) the rapid expansion of the universe, driven by white dwarf supernova, that we still observe today
B) the expansion of universe starting with the instant after the Big Bang
C) the sudden release of photons when particles and antiparticles annihilate each other
D) a sudden expansion of the universe driven by the energy released when the strong and electroweak forces froze out from the GUT force
E) the photons released when electrons and protons first combined, forming the Cosmic Microwave Background Radiation
Rolling stone in Mars
Placard near driver’s door, including what devices in the vehicle contain mercury.
Earth’s Spheres
Layers of Earth
Precession: Earth’s axis rotates, or “wobbles”
Formation of the Early Earth