Young et al. 2016 reports “Oxygen isotopic evidence for vigorous mixing” during the formation of this body. For 10 points each:
[10e] Name this astronomical object that is primarily responsible for the Earth’s tides.
ANSWER: Earth’s Moon
[10m] Young et al. build on this hypothesis, which suggests that the Moon formed from the coalescence of debris resulting from a collision between the Earth and Theia, a protoplanet that provided much of the Earth’s water.
ANSWER: giant-impact hypothesis [or Big Splash]
[10h] Two answers required. Theia is hypothesized to have orbited the Sun at one of these two points in the Earth–Sun system. Each Jupiter trojan orbits the Sun at one of these two points in the Jupiter–Sun system.
ANSWER: L4 AND L5 [or Lagrange point 4 AND Lagrange point 5; accept answers in either order]
<Michael Bentley, Science - Astronomy> ~13514~ <Editor: David Bass>