The pressure of sunlight was one of the forces that cleared the solar nebula
Indicate whether the statement is true or false
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This photograph shows x-ray emission from a supernova remnant. What is the source of the x-rays?
A) hot gas expanding outward from the site of a supernova B) cold gas that will soon give birth to new stars C) accretion disk around a black hole near the center of the supernova remnant D) spots within the remnant where hot gas is crashing into and destroying planets
Which color of visible light carries the most energy per photon?
A) red B) green C) blue D) violet E) all the same
Temperature measures
a. how much heat is in a substance. b. the internal energy of an object. c. the average speed of atoms and molecules in a substance. d. the average kinetic energy of atoms and molecules in a substance.
Group ______________A elements have two valence electrons
Fill in the blank(s) with correct word