The main reason that stars evolved off the main sequence is because they are becoming less massive as energy is lost into space from the proton-proton cycle
Indicate whether the statement is true or false
FALSE
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Compare the engineering and true secant elastic moduli for the natural rubber in Example Problem 6.2 at an engineering strain of 6.0. Assume that the deformation is all elastic.
What will be an ideal response?
What is the lifetime on the main sequence of a 2-solar-mass star compared to the approximately 10-billion-year life of our Sun? Pick the best answer
a. 1.8 × 10^11 years b. 1.8 × 10^10 years c. 1.8 × 10^8 years d. 1.8 × 10^6 years e. 1.8 × 10^3 years
In any particular place on Earth, certain constellations are visible in the evening only at certain times of the year because
A) our evening view of space depends on where Earth is located in its orbit around the Sun. B) during some times of year, some constellations drop below the southern horizon. C) some constellations are circumpolar. D) on any particular night, we can only see stars that are directly opposite (180 degrees away from) the Sun in the sky.
A person looking through eyeglasses sees real images
a. True b. False Indicate whether the statement is true or false