The First Time That Astronomers Observed Both Gravitational Waves and Electro-Magnetic

question 32

Multiple Choice

The first time that astronomers observed both gravitational waves and electro-magnetic waves from the same event, what they were observing was:

• A) a supernova explosion in one of the closest galaxies to us
• B) the spiraling toward each other of two neutron stars
• C) a binary star system where a giant star is overloading a white dwarf with too much material
• D) the merger of two black holes with masses dozens of times the mass of our Sun
• E) the collapse of an entire cluster of stars into one big black hole

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