Which of the following statements about the disk of the Milky Way is false?
A) The average age of disk stars is less than that of halo stars.
B) Disk stars are all younger than 5 billion years.
C) Disk stars have a higher proportion of heavy elements, on average, than halo stars.
D) Disk stars orbit in the same direction around the Galactic center.
E) The length of the disk is about 100 times its thickness.
B
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The discovered that the orbits of planets are ellipses.
What will be an ideal response?
The speed of the current warming trend is no different than those seen in fossil records
Indicate whether the statement is true or false
Halos are most often observed in the ____________ time of the year
a. spring b. summer c. fall d. winter
A 3.0-kg object moving 8.0 m/s in the positive x direction has a one-dimensional elastic collision with an object (mass = M) initially at rest. After the collision the object of unknown mass has a velocity of 6.0 m/s in the positive x direction. What is M?
A. 7.5 kg B. 5.0 kg C. 6.0 kg D. 4.2 kg E. 8.0 kg