What event marks the birth of a star, and what event marks its death?
What will be an ideal response?
Answer: A stellar body becomes a star when thermonuclear fusion is ignited in its core. Death occurs when its nuclear fires go out—when nuclear fusion ceases.
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For a real substance the enthalpy is function of temperature and pressure. Write an integral equation that expresses the enthalpy change per unit mass of the substance when the temperature and pressure change from T1 to T2 and p1 to p2.
What will be an ideal response?
The largest diameter telescopes are used to observe
A) radio waves. B) infrared light. C) visible light. D) ultraviolet light. E) x-rays.
Compared to the terrestrial planets, the jovian planets have ________ average densities
Fill in the blank(s) with correct word
Why use nuclear power on a satellite?
a. It can supply energy for many years on long space missions. b. Solar cells don't work well in the outer solar system far from the Sun. c. Sending radioactive materials into space is a good way to get rid of them so they don't create a hazard on Earth. d. all of the above