Stars and Galaxies

Stars, Constellations and Galaxis

By Ms. Velásquez

Our sun is the closest star to the Earth.

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​The sun

Homework

Investigate about your favorite constellation and galaxy. Make a power point presentations with the things your find interesting about them.

Stars are enormous spheres of gas where nuclear reaction take place.

This reaction produces enormous amounts of light and heat. ​

Stars

• color

• ​size

• luminosity​

Star Classification:

Stars can be blue, yellow, orange, red , white or blue.

A star's color ​depend on its temperature. Blue Stars are the hottest and also the youngest. Red stars are the coolest. The sun is a yellow star.

​Some text here about the topic of discussion.

Color

Stars can be different sizes. The smallest stars are smaller than the Earth. The Sun is an average star and its diameter is over 100 times the Earth's diameter. Very small stars are called white dwarf and enormous stars are called red giants.

Size

Luminosity is the amount of light from a star that reaches the earth. It depends on the size of the star, how hot it is and also how far it is from earth.

Luminosity

There are so many starts that we divide them into groups to make identification easier. Groups of stars are called constellations.

Constellations

A galaxy is an enormous system of stars, dust and gas that is held together by the force of gravity.

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There are billions of galaxies in the universe. It's possible to see some galaxies without telescopes, but they are so far away that they look like single points of light.

Galaxy

Galaxy Division

Can be round or oval shape. The largest galaxies are elliptical.

Eliliptical Galaxy

Have no shape. They are probably the young galaxies where new stars are formed.

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All galaxies constantly move trough space. Sometimes galaxies collied and smaller galaxies become part of a larger galaxy.​

Irregular Galaxy

Multiple Select

What three characteristics do we use to classify stars?

Pick three of them.

• color

• size

• luminosity

• shape

Multiple Choice

Stars are solid objects

• True

• False

Fill in the Blanks

Stars are enormous spheres of:

Multiple Choice

Blue stars are the youngest and hottest.

• True

• False

Multiple Choice

The sun is a red star

• True

• False

Fill in the Blanks

The sun is a

star: (color)

Multiple Choice

There are dwarf stars and giants stars.

• True

• False

Fill in the Blanks

Name small stars

Fill in the Blanks

Name enormous stars

Multiple Choice

All stars have the same amount of luminosity:

• True

• False

Multiple Choice

Choose the spiral galaxy

Multiple Choice

Choose the elliptical galaxy

Multiple Choice

Choose the irregular galaxy