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
The Mass of Impacts on Earth
Viking Mars Lander
The Atmosphere’s Oxygen Came from Photosynthetic Organisms
The Role of Gases in the Atmosphere
Weather maps: Pictures of the atmosphere
Views of Earth’s Layered Structure