Star Systems and Galaxies

by Mrs. Bennett

Galaxies

​Parallax-effect when position or direction of an object appears to differ when viewed from different positions against a distant background

​

​Parallax-continued

• Best used to measure nearby stars​

• When objects in space are super far away, the parallax is small (doesn't appear to move much) and not useful in determining an accurate measure of distance.

Multiple Choice

Parallax is when you observe motion of an object across

• a distant background

• another moving object

• the sun

Multiple Choice

Parallax is only useful for observing

• nearby stars

• far away stars

​Star Systems, Clusters & Galaxies-OH MY!

• Star system-two or more stars in a group

  • ​two-binary or double stars

  • ​three or more-multiple star system

• ​Star Cluster-stars in a larger grouping, formed from the same nebula at about the same time.

  • Open cluster-loose and disorganized​ (a few thousand stars)

  • Globular clusters-large groupings of older stars (more than a million)

• ​Galaxies-huge group of stars, star systems, star clusters, along with dust and gas held together by gravity (more than 100 billion stars)

Multiple Choice

Which has more stars, a star cluster or a galaxy?

• star cluster

• galaxy

Multiple Choice

Which star cluster group is loose and disorganized

• Open

• Globular

Multiple Choice

Which star cluster grouping contains older stars and may have more than a million of them?

• open

• globular

​Binary Stars-two stars orbiting each other

• ​One is usually much brighter and more massive than the other.

• ​The dimmer one's gravity causes the brighter one to wobble

• ​Eclipsing Binary=one passes in front of the other/blocking its light

Multiple Choice

Binary star systems have how many stars?

• obe

• two

• three

• four

​Galaxies

1. ​Spiral-middle aged stars/main sequence stars

2. ​Elliptical-old stars, no new stars forming

3. ​Irregular-young stars and new stars forming

4. ​Quasar-active, young galaxies with a black hole in the middle that gas spins around and glows

Multiple Choice

The Milky Way Galaxy is a 

• spiral
• lenticular
• elliptical 
• irregular

Multiple Choice

What type of galaxy is this?

• Spiral
• Elliptical
• Irregular
• Irrational

Multiple Choice

What type of galaxy is this?

• Spiral
• Elliptical
• Irregular 
• Irrational

Multiple Choice

What is not a galaxy?

• Optical Galaxy
• Spiral Galaxy
• Elliptical Galaxy
• Irregular Galaxy

Multiple Choice

How many stars are in a galaxy.

• millions or billions
• thousands
• hundreds
• Ten

Multiple Choice

Galaxies are composed of (best answer)

• stars
• stars and gas
• stars, dust, and gas
• stars, dust, and gas held together by gravity

​Lightyears

​Light travels 300,000,000 meters per second.

​Light travels 9,460,000,000,000 kilometers per year

​*Scientific notation=9.46 X 10 to the power of 12

​

​Lightyear=unit of distance, not time.

​

​Example: If you ride your bike at a speed of 10 km per hour and the mall is 10 km away, you could say the mall is "one bicycle hour away".

Multiple Choice

The universe is done expanding

• True

• False

Poll

Which type of lesson helps you learn best?

• Quizizz lesson

• Vocabulary

• Reading

• Hands on activity