Because they all involve the detonation of a carbon-rich white dwarf at Chandrasekhar's limit, all type I supernovae are equally luminous
Indicate whether the statement is true or false
TRUE
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According to the nebular theory, how did the Oort cloud form?
A) It is material left over from the interstellar cloud that never contracted with the rest of the gases to form the solar nebula. B) It is made of planetesimals that formed beyond Neptune's orbit and never accreted to form a planet. C) It consists of objects that fragmented from the Sun during a catastrophic collision early in the formation of the solar system. D) It is made of planetesimals between the orbits of Mars and Jupiter that never formed into a planet. E) It is made of planetesimals formed in the outer solar system that were flung into distant orbits by encounters with the jovian planets.
To measure how Mercury spins, astronomers sent ________ to Mercury and used the Doppler shift to determine how fast it was rotating
A) probes B) laser beams C) radar beams D) a satellite E) a single frequency radio signal
________ galaxies may bridge the gap between spiral galaxies and quasars
A) Hickson B) Arp C) Core-halo D) Seyfert E) Hubble
The Phanerozoic eon is divided into three main
A) epochs B) periods C) eras D) ages