Sun
A medium size yellow star describes what?
our sun
A huge group of stars is called what?
galaxy
The Milky Way is part of what group of galaxies?
The Local Group
Who studies the origin, properties and evolution of the universe?
cosmologists
What is an indication of the brightness of a celestial body?
magnitude
What two gases make up the sun?
helium and hydrogen
How many stars are in a galaxy?
between 1 million and one trillion
How many known galaxies are in the Local Group?
27
What is the most widely accepted theory of how the universe began?
the Big Bang
Define absolute magnitude
The apparent magnitude of an object that is 32.6 light years away from earth
How does our sun produce heat?
nuclear reactions
What is the shape of the Milky Way galaxy
spiral
Name another galaxy in the Local Group
Andromeda
Why is the Big Bang a theory?
There is no scientifically conclusive proof of how the Big Bang started or was created
Define apparent magnitude
The brightness of an object as seen from earth
What is the typcial life cycle of a star like our sun?
10 billion years
What are the different shapes of galaxies?
spiral, barred spiral, elliptical, and irregular
[GOOGLE] Where does the name Milky Way come from?
The Milky Way's name comes from an ancient Greek myth about the goddess Hera, who spilled milk across the sky while nursing Heracles.
OR
The Milky Way candy bar is named after a popular malted milk drink from the 1920s, not the Milky Way galaxy. The bar's flavor was designed to mimic the taste of malted milkshakes, and the bars were advertised as "a double malted milk in a candy bar".
What is some evidence that supports the Big Bang theory?
galaxies appear to be moving away from one another in all directions
cosmic background radiation has been detected
Why is a black hole called a black hole
A star is so dense and their gravity is so great that light cannot escape from them
Our sun began as what?
prostar
Describe a spiral galaxy.
dense circular center with arms spiraling out from the core
[GOOGLE] What is at the center of the Milky Way?
a supermassive black hole called Sagittarius A*
How do cosmologists estimate the age of the universe?
based on studying the current rate of expansion of the universe
What is the life cycle of a star like our sun and how likely is it that you will outlive it?
10 billion years
depends on your views on life after death : - ))