Classifying Stars

Stars

Recognize the physical attributes of stars in the night sky such as number, size, color and patterns.

Multiple Choice

The sun is a star

• True

• False

All about Stars

• Star may be different sizes and colors

• When seen from the Earth, most stars appear as small points of light because they are very far away.

Star Colors

• The color of a star tells us the temperature of a star

• Red stars are the coolest

• Yellow stars are hotter than red stars.

• White stars are hotter than red and yellow

• Blue stars are the hottest stars of all.

Multiple Choice

What color of star is the coolest?

• Red
• Yellow
• Blue
• White

Multiple Choice

What color of star is the hottest?

• Blue
• Red
• Yellow
• Orange

Why are some stars brighter than others?

One reason a star can seem brighter than another star is due to how much power a star has - which can also be explained as the amount of wattage it has (think of light bulbs!).

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Stars with more power (or higher wattage) will shine brighter than those with less power (lower wattage).

Why are some stars brighter than others?

Another reason is the distance of the star from the Earth. Just because a star looks brighter, doesn’t mean it actually is brighter. The more distant an object is, the dimmer it appears. Therefore, if two stars have the same level of brightness, but one is farther away, the closer star will appear brighter than the more distant star - even though they are equally bright!

Why are some stars brighter than others?

​https://www.youtube.com/watch?v=nwAS0HhRk5M&t=205s

Multiple Select

What are two reasons that one star can appear brighter than another star?

• power

• size

• distance

• brightness

Multiple Choice

All stars are the same color and same size.

• True

• False

There are five main differences between planets and stars:

1. Planets always orbit around a star. Never the other way around.

2. Planets are made of rock, ice, gas or water. Stars are made of plasma.

3. Stars emit their own light. Planets don’t.

4. Planets are always colder than the stars in their system.

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Difference between Stars and Planets

Multiple Choice

The Sun is a star

• True

• False

Multiple Choice

Planets Orbit around Stars

• True

• False

Multiple Choice

_________ are made of plasma.

• Planets

• Stars

Multiple Choice

Which is colder? Stars or Planet?

• Planets

• Stars

Drag and Drop

The closest star to the Earth is ​

Placeholder

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Drag these tiles and drop them in the correct blank above

the Sun

Polaris

Orion

Sirius