FCIM Mini-LessonSC.E.2.4.3

Astronomical UnitAU

ASTRONOMICAL UNIT or AU is the average distance between the

Earth and the Sun.

Astronomical units are used to measure distances within the solar system.

1AU = 1.5 X 108 km150,000,000 km150 million km

EXPLICIT INSTRUCTION

A LIGHT-YEAR is a unit of distance equal to the

distance light travels in one year.

1 light-year = 9.5 X 1012 km9,500,000,000,000 kilometers

9.5 trillion km

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The UNIVERSE is the sum ofall matter and energy that exists, that ever has existed,that will ever exist.

Earth is 1 AU from the Sun. Light from the Sun takes 8.3 minutes to reach Earth. Light from the Sun takes approximately 3.2 minutes to reach Mercury.

How far in AU is Mercury from the Sun?

MODELED INSTRUCTION

3.2 minutes (sunlight to reach Mercury) ÷ by 8.3 minutes (sunlight to reach Earth)= 0.39 AU

Sun to Earth is 1 AUSun to Mercury is shorter distance, < 1 (less than) AU

3.2/8.3 = 0.39 AU

Earth is 1 AU from the Sun.Light from the Sun takes 8.3 minutes to reach Earth. Light from the Sun takes 6 minutes to reach Venus.

How far in AU is Venus from the Sun?

G UIDED PRACTICE

6 minutes (sunlight to reach Venus) ÷ by 8.3 minutes (sunlight to reach Earth)= 0.72 AU

Sun to Earth is 1 AUSun to Venus is shorter distance, < (less than) 1AU

6/8.3 = 0.72 AU

Earth is 1 AU from the sun.Light from the Sun takes 8.3 minutes to reach Earth. Light from the Sun takes 43.25 minutes to reach Jupiter.

How far in AU is Jupiter from the Sun?

INDEPENDENT PRACTICE

43.2 minutes (sunlight to reach Jupiter) ÷ by 8.3 minutes (sunlight to reach Earth)= 5.2 AU Sun to Earth is 1 AUSun to Jupiter is a longer distance, > (greater than)1AU

43.2/8.3 = 5.2 AU

The distance that light travels in one year is 9.5 trillion km or(9.5 X 1012km). Alpha Centauri is 4.3 light-years away from Earth.

How far is the star Alpha Centauri from Earth?

INDEPENDENT PRACTICE

9.5 trillion km or (9.5 x 10 12 km) (1 light year)

X 4.3 light years (distance to Alpha Centauri in light years)

= (9.5 x 10 12) X 4.3= 40.85 x 10 12

Round to whole number= 41 x 10 12

Scientific notation= 41 x 10 12 to 4.1 x 10 13

=4.1 x 10 13 km