Transcript a light-year

FCIM Mini-Lesson
SC.E.2.4.3
Astronomical Unit
AU
EXPLICIT INSTRUCTION
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 km
150,000,000 km
150 million km
A LIGHT-YEAR is a unit of distance
equal to the
distance light travels in one year.
1 light-year = 9.5 X 1012 km
9,500,000,000,000 kilometers
9.5 trillion km
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The UNIVERSE is the sum of
all matter and energy that exists,
that ever has existed,
that will ever exist.
MODELED INSTRUCTION
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?
3.2 minutes (sunlight to reach Mercury)
÷ by 8.3 minutes (sunlight to reach Earth)
= 0.39 AU
Sun to Earth is 1 AU
Sun to Mercury is shorter distance,
< 1 (less than) AU
3.2/8.3 = 0.39 AU
G UIDED PRACTICE
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?
6 minutes (sunlight to reach Venus)
÷ by 8.3 minutes (sunlight to reach Earth)
= 0.72 AU
Sun to Earth is 1 AU
Sun to Venus is shorter distance,
< (less than) 1AU
6/8.3 = 0.72 AU
INDEPENDENT PRACTICE
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?
43.2 minutes (sunlight to reach Jupiter)
÷ by 8.3 minutes (sunlight to reach
Earth)
= 5.2 AU
Sun to Earth is 1 AU
Sun to Jupiter is a longer distance,
> (greater than)1AU
43.2/8.3 = 5.2 AU
INDEPENDENT PRACTICE
The distance that light travels in
one year is 9.5 trillion km or
12
(9.5 X 10 km).
Alpha Centauri is 4.3 light-years
away from Earth.
How far is the star Alpha Centauri
from Earth?
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