How has the chemical composition of the core of the Sun changed in the past 4.5 billion years? Are earthlings (if any) likely to freeze in another 4-5 billion years? Explain
What will be an ideal response?
The core of the Sun had an initial composition of 90% hydrogen and 9% helium. As hydrogen fusion has continued over the past 4.5 billion years the amount of helium produced has steadily increased. The center of the core now has about 85% helium and very little hydrogen. As a main sequence star the Sun will continue to brighten slowly. In another 4-5 billion years the Sun will have a core dominated by helium. This will force it to change into a red giant. Therefore, the Sun will only continue to brighten over time and the Earth will only get hotter, never colder.
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If the AA numerical designation of an alloy is followed by “T7”, the alloy is solution heat-treated and artificially _________.
Fill in the blank(s) with the appropriate word(s).
A__________is a small nebula that varies irregularly in brightness, evidently associated with star formation
A) Herbig-Haro object B) brown dwarf C) Bok globule D) T Tauri star
Professional astronomical telescopes generally have a much greater magnification than the telescopes you can buy in stores
Indicate whether the statement is true or false
A boy throws a ball to another boy who throws it back with half the original speed. What is the ratio of the final kinetic energy to the initial kinetic energy of the ball?
A) 0.25 B) 0.50 C) 2.00 D) 0.75 E) 1.0