## Objective:

I can explore the formation and characteristics of the solar

Click link to download the Solar System Notes

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**If the Sun is about 150,000,000 km from Earth, and light travels at 300,000 km/s, how long will it take light to reach Earth from the Sun?**

Solution:

Step 1: Divide the distance by the speed to determine how many seconds it takes for sunlight to reach Earth.

150,000,000 km / 300,000 km/s = 500 seconds.

Step 2: Convert seconds into minutes by dividing by 60.

500 s / 60 s = 8.2 minutes

That means the light you are seeing from the sun at this moment was actually created 8.2 minutes in the past!

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**Light Years: One light year is the distance that light can travel in one year.**

***We use light years for distances too large to measure in km**

How many kilometers does light travel in one year?

Solution:

Step 1: Multiply the speed of light by 60 to determine how far light travels in one minute.

300,000 km/s x 60 = 18,000,000 km/min

Step 2: Multiply the distance traveled in one minute by 60 to determine how far light travels in one hour.

18,000,000 km/min x 60 = 1,080,000,000 km/hr

Step 3: Multiply the distance traveled in one hour by 24 to determine how far light travels in one day.

1,080,000,000 km/hr x 24 = 25,920,000,000 km/day

Step 4: Multiply the distance traveled in one day by 365.25 to determine how far light travels in one year.

25,920,000,000 km/day x 365.25 = 9,467,280,000,000 km/year.

WOW! That’s about 9.4 TRILLION miles.

Helpful Links:

Earthrise Thinkquest: excellent resource on the sun, planets, moons, and dwarf planets. Organized charts with mass, diameter, orbital information, and important statistics.

Our Solar System Thinkquest: an ok resource for planetary information, but includes important atmospheric data. Suva Intermediate School in Bell Gardens, California

Dwarf Planets: provides a definition and discovery information regarding dwarf planets.

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