Which of the following sequences correctly describes the stages of life for a low-mass star?
A) protostar, red giant, main-sequence, white dwarf
B) protostar, main-sequence, white dwarf, red giant
C) white dwarf, main-sequence, red giant, protostar
D) protostar, main-sequence, red giant, white dwarf
E) red giant, protostar, main-sequence, white dwarf
Question 2
What happened to all of the quarks that existed freely during the particle era?
A) They froze out of the soup of particles at the end of the era.
B) They combined in groups to make protons, neutrons, and their antiparticles.
C) They evaporated.
D) They combined in groups to make electrons and neutrinos.
Artist's conception of the birth of a star within a dense molecular cloud.
Surface magnetic field of SU Aur (a young star of T Tauri type), reconstructed by means of Zeeman-Do
The stages of labor and delivery. (A) During the dilation stage the cervix thins and dilates to 10 c
Super's Five Stages of Career Development
A star link-type network where all of the modules are connected together using splice packs.
Lab: Mass Relationships in Chemical Reaction