About how much mass does our galaxy contain?
A. 1 billion solar masses
B. 1020 solar masses
C. 1 million solar masses
D. 1011 solar masses
Answer: D
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Quasars are radio sources that look like stars in visible-light photographs
a. True b. False Indicate whether the statement is true or false
Describe the large impact theory of the Moon's origin
What will be an ideal response?
A certain bulb with a resistance of 95 ohms and labeled "150 W" is designated for use in a
A) 120-V circuit. B) 240-V circuit. C) either D) not enough information
The Big Bang theory seems to explain how elements were formed during the first few minutes after the Big Bang. Which hypothetical observation (these are not real observations) would call our current theory into question?
A) the discovery of a galaxy with a helium abundance of only 10% by mass B) the discovery of a star-like object made almost entirely of carbon and oxygen C) the discovery of a planet that with no helium in its atmosphere D) the discovery of a galaxy with 27% helium by mass