Long-period comets are believed to come from the ______________
Fill in the blank(s) with correct word
Oort cloud
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What powers the Sun?
A. chemical burning of hydrogen and oxygen B. the breakdown of neutrinos C. nuclear fission of helium into hydrogen D. nuclear fusion of hydrogen into helium E. friction as it moves through the gases of space
What are oxidation reactions?
A) reactions that produce oxygen atoms B) reactions that destroy oxygen atoms C) reactions that remove oxygen from the atmosphere, such as fire and rust D) reactions that convert CO2 to O2 E) all of the above, i.e., any reaction involving oxygen
Why does conversion of its core to iron have to mark the end of a star's life? Which stars can end up with iron cores?
What will be an ideal response?
When a spring is stretched, its mass decreases
Indicate whether the statement is true or false