The Trojan asteroids have orbits that:
A) are, on average, closer to the Sun than we are.
B) cross the orbit of Earth at perihelion.
C) cross the orbit of Mars, but not Earth, at perihelion.
D) stay sixty degrees ahead of or behind Jupiter.
E) stay out beyond Neptune.
Question 2
How long does it take an M class star to reach the main sequence, compared to a solar type star?
A) a tenth as long
B) about the same, 30 million years
C) about twice as long
D) about twenty times longer
E) longer than the age of the Galaxy
On average, the ratio of carbon to nitrogen is much higher in terrestrial plants than in other major
A closer look at the citric acid cycle
Apparent and True Orbits of Alpha Centauri.
How to find the average atomic mass of an element
Overallocation of Labor to Farming When Farmworkers Are Paid Their Average Product
Average quarterly presidential approval rating, from Eisenhower to Trump