40 terms

Big Bang

A vast grouping of stars
Large clouds of dust and gas where new stars are born
Spiral Galaxies
Flat galaxies that include stars and nebulas (the milky was is an example)
Globular Clusters
Tight groups of stars in a halo around the Milky Way
Star Clusters
Stars that occur in small groups in galaxies
Stars are made mostly of
Hydrogen gas and helium gas
What is produced when hydrogen atoms fuse to form helium?
The sun's energy, like the energy of others stars in our universe
huge group of stars, dust, gas, and other celestial bodies bound together by gravitational force
a star that explodes and becomes extremely luminous in the process
black hole
a region in space where a collapsed star creates a vacuum and "sucks" up all of the surrounding stars/planets
Hubble's Law
the red shift distance law of galaxies
Cosmic microwave background radiation was discovered in
The term universe means
all of time, space, matter and energy
The big bang theory states the universe was formed
13.7 billion years ago
Friedrich Franz Friedmann
the first scientist to come up with the idea of big bang was
solar nebula
gravity pulled gas and dust together to form
the study of the origin, properties, processes, and evolution of the universe
big bang theory
the theory that state the universe began with a tremendous explosion 13.7 billion years ago
Scientists can calculate the age of the universe by
measurig the distance from Earth to various galaxies
A second way to calculate the age of the universe is
to calculate the ages of old, nearby stars
Milky Way
the galaxy we live in
The expansion of the universe can be compared to
raisin bread baking in an oven
To understand how the universe formed,
scientists study the movement of galaxies
Observations show that the universe is
Cosmic background radiation helps support
big bang theory
Scientists think that the universe may
expand forever
The distance that light travels in space in 1 year is
apparent magnitude
How are objects organized in the universe?
objects are organized according to a loosely repeated pattern and are part of a larger system.
Scientists think that the universe will
expand forever
According to the big bang theory, what filled the universe after the original explosion
cosmic background radiation
What are individual objects in the universe a part of?
a larger system
According to the big bang theory, ___ filled the universe after the original explosion.
cosmic background radiation
The Milky Way is
spiral galaxy
Galaxies that do not fit into any other class
irregular galaxy
Usually has very bright center and very little dust and gas
elliptical galaxy
Edwin Hubble
the astronomer for whom the Hubble Space Telescope is named
the brightness of a star
an enormous cloud of gas and dust in space that is the first stage of star formation
a large, hot ball of gases, which is held together by gravity and gives off its own light
a star that explodes, often a super giant that has become unstable