Earth and the Sun formed specifically from
A) unknown origins. B) other planets.
C) the galaxy. D) a nebula of dust and gases.
Question 2
The basic idea behind the planetesimal hypothesis is that
A) planets form as a direct result of the nuclear fusion of nebular gases and planetesimals.
B) small grains of cosmic dust and other solids gradual accrete to form planetesimals that may grow to become protoplanets and eventually planets.
C) early in the solar system's history, a star passed near to the Sun and pulled off gases that eventually condensed to form planets.
D) planets form from the remains of super-giant planetesimals that undergo nuclear fission and blow apart, thereby creating smaller objectsthe planets.
Geographical Origins of U.S. Latinos
Earth’s Revolution
Earth’s Layered Structure
Barred Spiral Galaxy
Earth-Moon-Sun Positions during the Spring Tide
The Last Man on Earth