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Transcript of Space
The IAU therefore resolves that planets and other bodies in our Solar System be defined into three distinct categories in the following way:
(1) A planet1 is a celestial body that
(a) is in orbit around the Sun,
(b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and
(c) has cleared the neighbourhood around its orbit.
(2) A dwarf planet is a celestial body that
(a) is in orbit around the Sun,
(b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape2,
(c) has not cleared the neighbourhood around its orbit, and
(d) is not a satellite. Inside a Solar System A Solar System is made of a star and
all of the things that orbit it such as:
meteoroids (dust, rocks, debris) Inside a Galaxy Called the Milky Way
which looks like this from earh And probably like this
from elsewhere in space Definied as:
a large system of stars held together by mutual gravitation and isolated from similar systems by vast regions of space. This is what we believe about our Galaxy:
1. Formed about 14 billion years ago
2. a spiral with a lot of stars in its center
3. Stars, dust, and gas fan out from the thick center in long spiraling arms
4. about 100,000 light years in diameter
5. Our solar system is on one of these spiral arms, about 26,000 light years from the center
6. All objects revolve around the center
7. It takes about 250 million years for our Solar System to complete one revolution around the center
8. Scientists have calculated that are about 400 billion stars in our galaxy
Inside the Universe Defined as:
The totallity of all matter,
energy and space that exist.
Current theory suggests it is
expanding. The map shows only what we (humans) have been able to "see" with telescopes out to about 2 billion light years across. Distance is an issue Standard units of measure
are too small for space, so
scientists devised new units
to measure with. Within our solar system:
Astronomical Units - AU
The average distance from
the Earth to the Sun or
93,000,000 miles A.U. Light-Year Within our galaxy and most
of the universe:
Light-years - The distance travelled by light, or other electromagnetic radiation, in one earth year through space.
One light year equals 9.4605 × 10^12 km, 5.88 trillion miles or 63240 astronomical units.
The standard speed of light is 186,282 miles per second.
Light takes 8.3 seconds to get from the sun to Earth. Motion There are 2 basic motions
of objects in space that are
important to us (humans) Rotation Revolution Rotation of a space object is
the act of spinning around a
point in the center of that object
(its axis). Revolution of a space object is
the act of moving around another
space object in a path (its orbit) The length of time it takes for a
planet to rotate one time.
a slower rotation = longer days
a faster rotation = shorter days The length of time it takes for
a planet to revolve once.
a slow revolution = long years
a fast revolution = short years
is caused by Gravity - a force that
pulls things IN Time it takes for Earth to revolve 1/4 of it's orbit.
Because our axis is tilted the north & south will lean toward, away from or neither compared to our heat source (the sun) Time A measure of the past,
present and future as observed
by humans. as a means to measure... Day Year Seasons Month The time it takes for our moon
to revolve around Earth one time
and cycle through all of it's phases.