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1. 
it can absorbs matter
A.
wormhole
B.
whitehole
C.
blackhole
D.
hawking
2. 
it's a natural attraction between two massive bodies
A.
speed
B.
gravity
C.
planet
D.
distance
3. 
Without it the planets will be absorbed by the black holes
A.
schwarzschild
B.
gravity
C.
distance
D.
escape velocity
4. 
it's a celestial bodies
A.
planet
B.
mass
C.
star
D.
distance
5. 
he wrote a theory about the escape velocity
A.
hawking
B.
schwarzschild
C.
wheeler
D.
einstein