The EMS
What does wave mean?
Something that increases and decreases in space and time.
What does the life cycle mean?
About 90% of all stars in our galaxy are in midlife converting hydrogen into helium.
How many different types of stars are there?
What are galaxies?
they are vast cosmic islands of stars, gas,dust, and dark matter held together by gravity.
When or how did the Big Bang start?
The universe began as a very hot, small, and dense super force. Then about 13.8 billion years ago, space expanded very quickly and then was named the Big Bang.
What does frequency mean?
The number of waves that pass a given point in a given time.
What are stars formed into?
They are formed into clouds of gas and dust.
What is the structure of a star?
four protons bang together and eventually form helium.
About how many galaxies are there in the universe?
Astronomers believe there are at least one hundred billion galaxies in the universe.
How long ago did the Big Bang start?
13.8 billion years ago
What does wavelength mean?
The distance between two neighboring peaks or troughs.
Where do nuclear reactions happen?
At the core (the center).
Where are the hottest stars on an HR diagram located?
The left-hand side.
What are irregular galaxies?
What is the Big Bang?
All matter and energy in the universe were compressed into an extremely small volume that 13 to 15 billion years ago exploded and began expanding in all directions.
Are the waves with the longest wavelength on the left or right?
Left
When is a star born?
Once it's hot enough for fusion reactions to take place at the core.
What are the different types of stars in order?
O,B,A,F,G,k
What are four types of galaxies?
What is the theory of the Big Bang?
The Big Bang Theory is the leading explanation about how the universe began.
Are the waves with the shortest wavelength on the left or right?
How long does each stage of a star last?
About 10 billion years.
Why do galaxies exist?
Galaxies were born when vast clouds of gas and dust collapsed under their own gravitational pull, allowing stars to form.
Did the Big Bang theory ever end?
No