The Herschels' grindstone model of the Milky Way star system was too small because
a. they did not count the brightest stars.
b. they did not study the southern sky.
c. they did not have large enough telescopes.
d. they only observed stars in the disk of the galaxy and not the halo.
e. they did not know about interstellar dust clouds.
Question 2
Convection is important in stars because it
a. increases the temperature of the star.
b. mixes the gases of the star.
c. transports energy outward in the star.
d. carries the neutrinos to the surface of the star where they can escape.
e. mixes the gases of the star and transports the energy outward in the star.
Proper Motion of Barnard’s Star
reproductive system in plants
Using a water-based cleaning system helps reduce the hazards from using strong chemicals.
Layout of the Nervous System
DNA double helix model
Model depicting how genetic recombination