What keeps red dwarfs from becoming giant stars?
What will be an ideal response?
Red dwarf interiors are highly convective, so hydrogen shell burning never creates the increase in energy needed to begin the red giant phase. Also, red dwarf stars are not massive enough to create the temperatures necessary for helium fusion.
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Survey Monkey and Doodle are examples of websites you can use to create ______.
A. 3D objects B. polls and surveys C. animated GIFs D. video
Which of the following telescopes must be used above Earth's atmosphere?
a. an optical telescope b. the VLBI telescope c. an x-ray telescope d. a radio telescope e. none of the above
Complete and balance the equation: Zn + AgNO3(aq) ? ____________________
Fill in the blank(s) with correct word
If we could put all the asteroids together, their total mass would be
A) much less than the mass of any terrestrial planet. B) about the mass of Mercury. C) about the mass of Earth. D) greater than the mass of Earth but less than the mass of Jupiter.