1.
this theory predicts the universe will end in a cold, dark, empty state due to continued accelerated expansion
2.
This theory states that the universe will continue to expand so fast and intensely that eventually it will tear apart all matter, leaving nothing but empty space
3.
this theory proposes that the universe’s current expansion will eventually reverse, causing all matter and energy to collapse back into a high-density single point
4.
is the current leading theory as to the origins of the universe.
5.
the faint leftover energy and radiation from the original moment of expansion, in short form
6.
this is how the universe began, despite being called a bang. instead it was a gradual, controlled increase in volume or size
7.
this galaxy type will have irregular shapes, more gas dust than most, will eventually become a different shape/type
8.
this galaxy type will be spherical or oval shaped, older with very little gas/dust
9.
this galaxy type will be a flattened disk with a central bulge and spiral arms
10.
this galaxy type will be similar to a spiral galaxy, but with a flat disk that has no spiral shape.
11.
two enormous, invisible-to-the-eye structures that emit high-energy gamma rays and likely resulted from a massive, ancient energy release from our galaxy's central supermassive black hole
12.
a dense, centrally located, football-shaped (or bar-shaped) region of older, yellowish stars surrounding the core of a spiral galaxy like the Milky Way
13.
the dynamical center of a galaxy, usually characterized by the presence of a massive black hole and surrounded by clusters of massive stars
14.
an extended, roughly spherical light surrounding a galaxy, extending far beyond its bright, central disk
15.
a region in space where matter is packed so densely that gravity prevents anything, including light, from escaping
16.
the incredibly luminous, compact center of a distant galaxy powered by a supermassive black hole feeding on gas and dust
17.
the center of a black hole where matter is crushed into an infinitely dense point, and the laws of physics as we understand them break down
18.
the theoretical "point of no return" surrounding a black hole, where gravitational pull is so intense that escape velocity exceeds the speed of light
19.
the large dust cloud that surrounds the accretion disk in a quasar
20.
a rotating structure of gas, dust, and stellar debris that forms around massive celestial objects, such as black holes
21.
powerful, relativistic streams of plasma and radiation launched from the poles of accreting black holes at near-light speeds
22.
the continuous, irreversible progression of existence and events, moving from the past through the present and into the future
23.
the boundless, three-dimensional, continuous expanse extending in all directions that contains all matter
24.
a physics phenomenon where time passes at different rates for observers depending on their relative motion or proximity to a gravitational field
