Transcript earth`s place in the universe

EARTH’S PLACE IN THE
UNIVERSE
A journey through the universe at
the speed of light: 300,000 km/sec.
Earth is 150,000,000 km from the
sun = 1 astronomical unit.
Stop One-
STOP 1: YOU HAVE TRAVELED 8
MINUTES SINCE LEAVING EARTH.
1. How many planets are 1 AU or less
from the Sun?
3: Mercury, Venus, Earth.
2. Would all planets be on the same side
of the Sun as Earth is?
No.
Stop Two-
STOP 2: YOU HAVE TRAVELED 14
HOURS SINCE LEAVING EARTH.
1. What does 100 AU mean?
100 AU x 150,000,000 km/AU =
15 billion km.
2. If you are looking down over the north
pole of the planets, in what direction
would you expect them to be moving
around the sun?
Counterclockwise.
Stop Three-
STOP 3: YOU HAVE TRAVELED 0.16
YEARS (58 DAYS) SINCE LEAVING EARTH.
1 Light Year = 63,240 AU
1. How many kilometers are in 1 light
year?
300,000 km/sec x 60 sec/min x 60
min/hr x 24 hr/day x 365 day/year =
9.5 trillion km.
2. How far are you from Earth in
Kilometers?
.16 LY x 9.5 trillion km/LY =
1,517,760,000,000 km.
Stop Four-
STOP 4: YOU HAVE TRAVELED 16 YEARS
SINCE LEAVING EARTH.
1. In AU’s, how far are you from Earth?
16 LY x 63,240 AU/LY =
1,011,840 AU.
2. Sirius is 8 light years from Earth. How
long would it take for light from Sirius
to reach Earth?
8 years.
Stop Five-
Stop Five-
STOP 5: YOU HAVE TRAVELED 1600
YEARS SINCE LEAVING EARTH.
1. What constellations shown in the star
chart are the same as those you
would see 1600 light years from
Earth?
Orion, the Pleides, Deneb, etc.
Stop Six-
STOP 6: YOU HAVE TRAVELED 160,000
YEARS SINCE LEAVING EARTH.
1. A galaxy has been described as an
island universe. What does this
mean?
Islands are surrounded by water like
a galaxy is surrounded by open space.
2. Where do most of the stars seem to
be concentrated in the Milky Way
galaxy?
In the center of the galaxy.
Stop Seven-
Stop Seven-
STOP 7: YOU HAVE TRAVELED 16,000,000
YEARS SINCE LEAVING EARTH.
1. Andromeda is 2.2 million light-years from
Earth. Astronomers study it through the
light it emits. How long ago did that light
leave Andromeda?
2.2 million years ago.
2. Studying distant galaxies is described as
looking back into the past. What does this
mean?
Since galaxies are so far away,
observations are what they looked like
when the light left them.
3. You decide to pause on your trip to
write a letter back home. When will
your letter arrive if it travels at the
speed of light?
16 million years from now.
4. How would you address your letter?
What is your cosmic address?
Universe, Local Group of Galaxies,
Milky Way, Orion Arm, Solar System,
Earth, USA, California…