Disk
(a) A flattened, circular region of gas, dust, and/or stars. It may refer to
material surrounding a newly-formed star; material accreting onto a black hole
or neutron
star; or the large region of a spiral galaxy containing the spiral arms.
(b) The apparent circular shape of the Sun, a planet, or the moon when seen in
the sky or through a telescope.
Source: wikipedia, NASA
No comments:
Post a Comment