In essence, the nebular theory holds that ________
A) the planets each formed from the collapse of its own separate nebula
B) our solar system formed from the collapse of an interstellar cloud of gas and dust
C) nebulae are clouds of gas and dust in space
D) The nebular theory is a discarded idea that imagined planets forming as a result of a near-collision between our Sun and another star.
B
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What type of bond is formed whenever atoms share a pair of electrons?
a. covalent b. hydrogen c. ionic d. double e. peptide
When a star becomes a red giant, its core expands to a roughly proportional larger size too
Indicate whether the statement is true or false
The most reactive of all elements is
a. hydrogen. b. fluorine. c. chlorine. d. sodium.
According to Kepler results in mid-2013, what fraction of stars host an Earth-size planet?
A) about 20% B) about 100% C) about 15% D) about 70%