Multiple Choice
It was recently discovered that the Scorpius-Centaurus OB association passed within 150 light-years of the solar system perhaps 2 million years ago.What is the significance?
A) A supernova eruption in the association at that time may have sent shock waves that led to the collapse of a dark dust cloud to form the solar nebular disk.
B) A supernova eruption in the association at that time may have sent large amounts of radiation that overwhelmed the Earth's protective ozone layer and caused widespread biological extinctions.
C) The gravitational influence of the association probably caused the migration of the giant planets in our solar system to their present locations.
D) A supernova eruption in the association at that time may have been the source of the radioactive aluminum isotope that was once part of some meteorites, like the Allende meteorite.
Correct Answer:
Verified
Correct Answer:
Verified
Q20: The nuclear process in which helium fusion
Q35: Are crystalline stars or crystalline remnants of
Q69: A child on a playground swing is
Q94: A low-mass giant on the horizontal branch
Q95: A white dwarf is a(n):<br>A) object like
Q98: The main source of cosmic rays,the high-energy
Q100: What is the observed distribution of the
Q102: At which location will Newton's laws of
Q128: The escape velocity of matter from the
Q211: The core collapse phase at the end