Ethically to a study at the latest professed in a journal called 'Physical Review Letters', for the first time, scientists have succeeded in look into gravitational waves in a newly born black hole. Black holes are holes in space where the force of gravity is so high that there is no transit of light from here. Since light cannot emit from them, we do not see black holes, they are invisible. Based on the rotation pattern of these waves, the mass of a black hole and its rotation speed can be estimated. This lends further credence to Einstein's General Theory of Relativity (Einstein's General Theory of Relativity).
1. What is the diameter of the black hole in m87?
A. 3.36×10−5 parsecs
B. 3.36×10−4 parsecs
C. 3.36×10−3 parsecs
D. 3.36×10−2 parsecs
2. The term black hole was first used by American physicist ___________ in the mid-1960s.
A. John Wheeler
B. John Dalton
C. Derek Abbott
D. Ernst Karl Abbe
3. How big is Sagittarius A black hole?
A. 33 million km
B. 22 million km
C. 44 million km
D. 55 million km
4. What is the opposite of a black hole?
A. Blue hole
B. Green hall
C. White hole
D. Yellow hall
5. How old is Messier 87?
A. 13.00 billion years
B. 14.24 billion years
C. 13.54 billion years
D. 13.24 billion years
6. What powerful force allows black holes to absorb light?
A. Nuclear fusion
B. Electromagnetism
C. Gravity
D. Nuclear bonding
7. What is it called when an aging star explodes?
A. Iris
B. Singularity
C. Supernova
D. Pulsar
8. How do black holes form?
A. When planets collide
B. When nuclear bombs explode
C. When comets strike planets
D. When giant stars explode
9. Where do supermassive black holes likely exist?
A. At the center of the Solar System Inside gas giant planets
B. At the center of galaxies
C. Both of them
D. None of them
10. What do we call the boundary around a black hole where nothing can escape its gravity?
A. The Great Wall
B. Singularity
C. Supernova border
D. Event horizon
11. What is the center of a black hole called?
A. Iris
B. Singularity
C. Supernova
D. Pulsar
12. What makes the gravity of a black hole so strong?
A. Its large size and small mass Nuclear reactions at its core
B. It spins at a rate faster than light
C. Its small size and large mass
D. All of the above
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