Light & Energy
This is energy that travels through space as waves, including visible light, X-rays, and radio waves.
What is electromagnetic energy?
These waves have the longest wavelength and lowest frequency.
What are radio waves?
Stars are classified mainly by their temperature, color, and this.
What is brightness?
This is a group of stars that forms a pattern in the night sky.
What is a constellation?
On an H-R diagram, stars get hotter as you move in this direction.
What is to the left?
This term means the distance from one wave peak to the next.
What is wavelength?
These waves have the shortest wavelength and highest frequency.
What are gamma rays?
This diagram shows the relationship between a star’s temperature and brightness.
What is the H-R Diagram?
This is the distance light travels in one year.
What is a light year?
On an H-R diagram, stars get brighter as you move in this direction.
What is upward?
This is the number of waves that pass a point each second.
What is frequency?
As wavelength decreases, this increases.
What is frequency?
Most stars, including the Sun, belong to this group.
What is the Main Sequence?
This is a huge group of billions of stars held together by gravity.
What is a galaxy?
The Sun belongs to this group on the H-R diagram.
What is the Main Sequence?
This effect explains why light changes color when an object moves toward or away from Earth.
What is the Doppler Effect?
This type of light is the only part of the spectrum humans can see.
What is visible light?
These stars are cool but very bright and appear in the upper right of the H-R diagram.
What are red giants?
This includes all space, time, matter, and energy.
What is the universe?
The upper left of the H-R diagram contains stars that are this.
What are hot and bright?
This method measures the apparent shift of a nearby star to find its distance.
What is parallax?
Infrared, visible, and ultraviolet are all types of this.
What are electromagnetic waves?
These stars are hot but dim and found in the lower left of the H-R diagram.
What are white dwarfs?
This is a cooler, darker spot on the Sun’s surface.
What is a sunspot?
The lower right of the H-R diagram contains stars that are this.
What are cool and dim?