A rock found on Earth that crashed down from space is called ________.
A) an impact B) an asteroid C) a meteor D) a meteorite
Question 2
How would you expect a star that formed recently in the disk of the galaxy to differ from one that formed early in the history of the disk?
A) It should have a higher fraction of elements heavier than hydrogen and helium.
B) It should be much brighter.
C) It should be higher in mass.
D) It should orbit the galactic center at a much higher rate of speed.
E) All of the above would be expected.
The monthly changes of angle between the direction of illumination by the Sun and viewing from Earth
The reflection nebula NGC 1999 is brilliantly illuminated by V380 Orionis (center), a variable star
In 1839 Mary Cragin, at the age of twenty-nine, became a convert to John Humphrey Noyes’s “communism
Earth’s Spheres
International space station
Core-promoter elements found in focused promoters