Presentation is loading. Please wait.

Presentation is loading. Please wait.

What is a Light Year? http://janus.astro.umd.edu/astro/distance/

Published byJelle Vermeiren Modified over 4 years ago

Similar presentations

Presentation on theme: "What is a Light Year? http://janus.astro.umd.edu/astro/distance/"— Presentation transcript:

1 What is a Light Year?

2 If you could travel to the closest star from the sun in a car traveling 60 mph, how long would it take you to get there?

3 48 million years

4 If you could travel to the closest star from the Earth in a space shuttle at 18,000 mph, how long would it take you to get there?

5 160,000 years

6 If you ride on a beam of light, how long would it take you to get there? It travels 300,000,000 m/s

7 4.29 years

8 Why do we use Light Years?
Because distances in space are too vast (big), miles and kilometers are too small to be used. Scientists measure the distances in space outside our solar system in light years (ly)

9 The Milky Way is the galaxy in which the Solar System is located.
The Milky Way Galaxy is about 100,000 light years across

10 One light-year is the DISTANCE that light travels in one year
What is a Light Year? One light-year is the DISTANCE that light travels in one year

11 HOW FAR a Light Year is, If we are going to find out
we need to know two things… The speed of light, measured in meters per second and The number of seconds in a year

12 What’s the fastest speed in the universe?
- The Speed of Light What is the speed of light? (abbreviated “c”) 300,000,000 meters per second or 3 X 108 m/s

13 How Many Seconds in a Year?
60 seconds per minute X minutes per hour X hours per day X days per year = the number of seconds per year 31.55 million

14 So How Far is a Light Year?
9,500,000,000,000,000 meters. This said out loud is.. That’s Nine Quadrillion, Five Hundred Trillion Meters

15 What is this in scientific notation?
9,500,000,000,000,000 meters. In scientific notation, this is 9.5 x 1015 m

16 Distance from the Earth
Practice! Location Distance from the Earth Standard Form Scientific Notation Proxima Centauri 4.29 ly Center of the Milky Way 2.99 x 104 ly Andromeda 2,490,000 ly Coma Cluster of Galaxies 3.34 x108 ly Edge of the observable Universe 14,900,000,000 ly

17 More Practice! Location Distance from the Sun Standard Form
Scientific Notation Mercury 57,910,000 km Earth 1.496 x 108 km Mars 2.279 x 108 km Saturn 1,426,730,000 km Pluto 5,906,380,000 km

18

Download ppt "What is a Light Year? http://janus.astro.umd.edu/astro/distance/"

Similar presentations

1 A walk through the Universe Space is big. You just wont believe how vastly, hugely, mind-bogglingly big it is. I mean, you may think its a long way down.

1 A walk through the Universe Space is big. You just wont believe how vastly, hugely, mind-bogglingly big it is. I mean, you may think its a long way down.
of Earth (in the center)

of Earth (in the center)
How many light years old are you?

How many light years old are you?
How many light years old are you?

How many light years old are you?
The Metric System - BIG Okay, so you have gotten a look at the metric world of the small and very small, but now it is time to look at the metric world.

The Metric System - BIG Okay, so you have gotten a look at the metric world of the small and very small, but now it is time to look at the metric world.
Distances in Space.

Distances in Space.
U2: Astronomy - Measuring Space Distances FLIP LESSON.

U2: Astronomy - Measuring Space Distances FLIP LESSON.
Astronomy class: Pages 2-9

Astronomy class: Pages 2-9
Distances in our Universe The universe is so large that we must use special units of measurement. Kilometers and miles just won’t cut it.

Distances in our Universe The universe is so large that we must use special units of measurement. Kilometers and miles just won’t cut it.
Astronomical Units & Light Years Project. Distance in Space An ellipse is an oval-shaped path. An astronomical unit (AU) is the average distance between.

Astronomical Units & Light Years Project. Distance in Space An ellipse is an oval-shaped path. An astronomical unit (AU) is the average distance between.
Measuring Distances in Space Astronomical Units, Light Years, Parsecs.

Measuring Distances in Space Astronomical Units, Light Years, Parsecs.
Astronomy Astronomy = study of celestial objects and phenomena outside Earth’s atmosphere Includes galaxies, stars, planets, moons, cosmic radiation, etc.

Astronomy Astronomy = study of celestial objects and phenomena outside Earth’s atmosphere Includes galaxies, stars, planets, moons, cosmic radiation, etc.
Astronomy in the News It turns out there is five times more material in clusters of galaxies than we would expect from the galaxies and hot gas we can.

Astronomy in the News It turns out there is five times more material in clusters of galaxies than we would expect from the galaxies and hot gas we can.
Light Years Away.. Questions 1-10 (1 point each) Question 11 (2 points) Total Points (12 Points)

Light Years Away.. Questions 1-10 (1 point each) Question 11 (2 points) Total Points (12 Points)
Topic: Light Years Essential Question: How do scientists use light years to measure distances in our universe?

Topic: Light Years Essential Question: How do scientists use light years to measure distances in our universe?
Objectives: Learn what units scientists measure distances in space. Define and use an astronomical unit to measure distances in space. Define and use a.

Objectives: Learn what units scientists measure distances in space. Define and use an astronomical unit to measure distances in space. Define and use a.
Distances in Space This Mini Lesson Will Cover: What units do astronomers use to measure vast distances in space?

Distances in Space This Mini Lesson Will Cover: What units do astronomers use to measure vast distances in space?
The Sun  The sun is a medium size star  It appears larger than the other stars because of its relative nearness to the earth  It consists of about.

The Sun  The sun is a medium size star  It appears larger than the other stars because of its relative nearness to the earth  It consists of about.
Section 9.1 Measuring Distances Beyond the Solar System.

Section 9.1 Measuring Distances Beyond the Solar System.
Here and Now Chapter 1. Where are You? To find our place among the stars, we will zoom out from a familiar scene, to the largest scales in the universe.

Here and Now Chapter 1. Where are You? To find our place among the stars, we will zoom out from a familiar scene, to the largest scales in the universe.

Similar presentations

Ads by Google