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BLACK HOLES, Bibliografia "Science in school. The European journal…
BLACK HOLES
WHAT IS A BLACK HOLE?
The black hole is a collapsed star or SINGULARITY
Near the singularity gravity is so strong that even light can't escape
As a certain distance from the singurality gravity is weak enough to allow light to escape
objects outside this horizon feel the black hole's gravity
they can be seen and also escape
EVENT HORIZON
HOW TO OBSERVE BLACK HOLES?
The astronomers observe objects in space by looking at the light
black holes are dark
they don't emit any light
Astronomers OBSERVE THE INTERACTION WITH OTHER OBJECTS
interact with the gravity force of the black hole
WHERE THEY COME FROM?
Death of very massive stars
the core of the star is formed by gas wich are pulled togheter by the thermonuclear fusion
-Heavier materials
-Higher pressure
-Higher temperature
conteracts the force of gravity pulling gas trowards the center of the star
when the star runs out of Helium and Hydrogen it becomes impossible to go on with the process
unable to cross the force of gravity
the star becomes smaller and smaller --> its destiny is to become a singurality
CAN IT GROW?
Black holes can encrise theis mass and also their gravity actraction
If the black absorbs enough materials it can become a SUPERMASSIVE BLACK HOLE
this kind of black hole exists in the centres of galaxies (including the Milky Way)
by absorbing mass from other objects surroundings
from other stars
from other black holes
Bibliografia
"Science in school. The European journal for science teachers"
https://www.scienceinschool.org/article/2013/blackholes/
