Why do astronomers believe Triton may have been a planet that was captured by Neptune?
A) It orbits Neptune in the opposite direction of Neptune's rotation.
B) It is too large to have been formed in the jovian nebula that formed Neptune.
C) It has an atmosphere and a measurable greenhouse effect.
D) It undergoes seasonal changes.
E) It is colder than any other moon or planet.
Question 2
On a Hertzsprung-Russell diagram, where would we find white dwarfs?
A) upper right
B) lower right
C) upper left
D) lower left
From space earth shows itself as a planet covered mostly by water.
Astronomers identified 12-billion-year-old white dwarf stars only 100 light years away from Earth
Artist's rendition of the view from a hypothetical airless planet orbiting Alpha Centauri A
The Capture and Destruction of Triton
Dwarf Planet Eris
Benvenuto Cellini, Saltcellar: Neptune (Sea) and Tellus (Earth).