Ripples in the Cosmic Microwave Background correspond to:
A) matter density fluctuations.
B) temperature fluctuations.
C) energy fluctuations.
D) fluctuations in both matter and radiation.
E) imperfections in measurement techniques or equipment.
Question 2
Which of the following is most like the rotation of stars in the disk of the Milky Way?
A) a DVD in a player
B) the planets in our solar system
C) cars moving at a constant speed on a circular race track
D) the hands of an analog clock
E) the tire of a car moving
Young Circumstellar Disks of Matter
Time Slows Down Near Matter
In plant fossils, stomatal density is used to estimate CO2 concentration in the atmosphere
Stomatal density and carbon dioxide
Medial view of tracts revealed by removing gray matter from a midsagittal section