The most massive main-sequence stars are the ________ spectral class and the ________ luminosity class
Fill in the blank(s) with correct word
O, V
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What is the name of the box in which you edit and format text for a text image?
A. text box B. bounding box C. logo box D. font box
A metallic coin is given a negative electric charge. Its mass:
1.increases measurably. 2.increases by an amount too small to measure directly. 3.remains unchanged. 4.decreases by an amount too small to measure directly. 5.decreases measurably.
Which of the following is true of carbonaceous chondrites?
A) They contain materials left over from the formation of the Solar System. B) They do not contain any volatile compounds. C) They are a class of iron meteorites. D) They are a class of stony-iron meteorites.
The scientific discipline of astrobiology is
A) one of the oldest branches of science B) a relatively young branch of science C) a similar age to other fundamental disciplines like physics and chemistry D) a hypothetical branch of science which has yet to be established