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1. 
What is a black hole?
A.
Set of stars grouped in a celestial region that form, apparently, a certain figure.
B.
It´s a region in space where the force of gravity is so strong that nothing, not even light, is able to escape. Gravity is so powerful because matter has been squeezed in a tiny space.
C.
is a hypothetical topological characteristic of a space-time, described in the equations of general relativity, which essentially consists of a shortcut through space and time. A wormhole has at least two ends connected to a single throat, through which matter could move
2. 
Why we can´t see them ?
A.
because not even, the light can escape from it and because any event that happens inside it, is hidden forever
B.
because they are imaginary sequences, the matter adheres to this and as it does not exist, it is not possible to see
C.
A y B
3. 
What is the name of the galaxy in which the black hole is located?
A.
Yugopotamia
B.
Milky Way
C.
Messier 87
4. 
In which day the image of the black hole was revealed ?
A.
March 17
B.
January 26
C.
April 10
5. 
What is the mass of the black hole?
A.
8.9 billion times the mass of our sun
B.
6.5 billion times the mass of our sun
C.
9.5 million times the mass of our sun