How much of the solar system's mass is in the Sun?
The Sun contains about 99.8% of all the mass in our solar system.
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- What was the first black hole discovered?
“Cygnus X-1 was the first object widely accepted as a black hole.”
Reference: NASA
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What is Hawking radiation?
Stephen Hawking predicted that black holes slowly give off energy, now called Hawking radiation.
Who discovered the four largest moons of Jupiter?
Italian scientist Galileo Galilei discovered Jupiter's four largest moons in 1610 using a telescope he improved himself.