Question: Astronomers discover a binary star system including a 0 . 5 M o . giant and a 4 . 0 M o . main -

Astronomers discover a binary star system including a 0.5Mo. giant and a 4.0Mo. main-sequence star. Assume that the two stars formed at the same time. Which of the following conclusions could be drawn?
The two stars must orbit extremely close to each other.
The situation is impossible. Either the stars did not form at the same time, or the measurements are wrong.
The stars are most likely made out of different substances.
The two stars will have identical absorption spectra.
This is common since high-mass stars have longer lives than low-mass stars.
Astronomers discover a binary star system

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