There have not
been any direct observations of a
black hole due to event horizons
which prevent direct observations.
(Fabris, et. al., 2013) An event
horizon is a distance away from a
black hole where even light is not
able to escape the gravity of the
black hole. (Berman, 2014). Many supermassive black
holes are thought to exist at the
center of galaxies. The spin factor
and electric charge have not been
observed for Sagittarius A*
at the center of the Milky Way. (Larranaga, 2015).
One possible way to gain knowledge
about black holes is to observe its
shadow. (Larranaga, 2015).
A large telescope
called the Event Horizon Telescope
is being set up to observe the dust
could G2 being swallowed up by
Sagittarius A*. (Nadis,
2014). The event horizon telescope
is made by linking several radio
telescopes across the planet all
aimed at a single object such as a
black hole. (Nadis, 2014)..
