What are some complications that interfere with star formation?
What will be an ideal response?
A rapidly spinning nebula may prevent more matter from collapsing to the central protostar, and magnetic fields may deflect the gas away from the star as well.
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What distance method did Edwin Hubble use to determine the distance to local galaxies?
a. Hubble law b. supernova observations c. period-luminosity relationship of variable stars d. parallax
Most of the Moon's surface is densely covered with craters, but we find relatively few craters within the lunar maria. What can we conclude?
A) The maria formed after the heavy bombardment ended. B) The maria formed within the past 1 billion years. C) The regions of the maria were hit by fewer impacts than the densely cratered regions. D) Erosion affects the maria more than it affects other regions of the Moon.
The binding energy per nucleon
A) decreases steadily as we go to heavier elements. B) increases steadily as we go to heavier elements. C) is approximately constant throughout the periodic table, except for very light nuclei. D) has a minimum near iron in the periodic table.
A carboxylic acid reacting with an alcohol forms water and a(n)______________
Fill in the blank(s) with correct word