The Big Bang
The universe began as a small, very dense ________.
singularity
Which type of electromagnetic radiation is used to cook food?
Microwaves
Which color of star is the coolest?
Red stars
In which layer of a star does convection occur?
The convection zone
What type of galaxy is the Milky Way?
Which law states that the redshifts of far away galaxies are proportional to their distance?
Hubble's law
Which type of electromagnetic radiation is used in airports for security?
X-rays
What are the stars in the diagonal line going from bottom right to top left in the HR diagram classified as?
Main sequence stars.
Which layer of the sun is only visible during a total solar eclipse?
The red glow of the chromosphere is visible during a total solar eclipse.
What are the three main types of galaxies?
Spiral galaxies, elliptical galaxies, and irregular galaxies.
How old is the universe?
14 billion years old
slower
What happens to a white dwarf star over billions of years?
It gets cooler and eventually fades.
In which layer of a star does nuclear fusion occur?
the core
Which type of galaxy is usually mostly gas, dust, and stars?
Irregular galaxies
What is radiation left over from the big bang called?
Cosmic microwave background
Which type of electromagnetic radiation is the highest in energy?
Gamma rays
Which stars are very hot and dense but very small?
white dwarf stars
What is the outermost layer of the Sun?
the corona
Which type of galaxy is tightly packed with stars?
Did the singularity contain all of the mass in the universe?
Yes.
True or False: Higher frequency waves contain more energy.
True.
What happens to stars much more massive than the Sun after becoming red giants?
Which layer of a star is visible?
the photosphere
What is typically in the center of a spiral galaxy?
A black hole