What do halo stars do differently from disk stars?
A) They orbit the galactic center with many different inclinations, while disk stars all orbit in nearly the same plane.
B) Halo stars explode as supernovae much more frequently than disk stars.
C) They remain stationary, quite unlike disk stars that orbit the galactic center.
D) They orbit the center of the galaxy at much lower speeds than disk star.
A
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A(n) ____ is a solar system object that enters Earth's atmosphere and becomes very hot due to friction between the object and Earth's atmosphere and does not survive to reach the surface
a. asteroid b. meteor c. comet d. meteoroid e. planetesimal
Why are transformer cores made of laminated, rather than solid, magnetic material?
What will be an ideal response?
A type Sa galaxy has a larger ________ than type Sc
A) nuclear bulge B) halo C) mass D) number of stars E) spiral structure
Regarding the Earth and a cloud layer 800 m above the Earth as the "plates" of a capacitor, calculate the capacitance if the cloud layer has an area of 1.0 km2 . If an electric field of 2.0 × 10^6 N/C makes the air break down and conduct electricity (lightning), what is the maximum charge the cloud can hold?