The creation of ____ require(s) that a young hot star (T 25,000 K) be relatively nearby
a. Emission nebulae
b. HI regions
c. Molecular clouds
d. The cool gas of the interstellar medium
e. 21 cm radiation
A
Physics & Space Science
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A spherical hot air balloon of diameter 20. meters just floats (hovers) when the hot air inside has been heated to a density of 1.00 kg/m3
What is the weight of the balloon and cargo (not including the air inside) if the surrounding air has a density of 1.30 kg/m3?
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Why does Earth have so much more oxygen (O2 ) than Venus or Mars?
What will be an ideal response?
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Which will warm up quicker in sunlight?
A) a piece of colored glass B) a piece of clear glass C) both the same
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Upper-main-sequence stars, more massive than the Sun, fuse hydrogen by the proton-proton chain
Indicate whether the statement is true or false
Physics & Space Science