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Introduction to Astronomy
Astronomy is the study of the universe and the objects in it.
The Universe is all the matter and energy that exists everywhere. The universe includes:
o All stars and constellations, galaxies
o
o Planets, moons and satellites
o
o Asteroids
o Plasma
Star Constellations
A constellation is a
that forms a shape or pattern
Constellations are used for
one’s
,
, finding
on land and at sea.
These stars appear to
from East to West across the celestial sphere.
The stars appear to move across the sky in one night, but this is just an illusion due to
.
Rotation
The apparent daily motion of celestial objects is due to Earth’s
Rotation is the
.
of an object on its axis.
Celestial objects are not actually moving from east to west across the sky, rather the earth is
under them.
Revolution
Revolution is the
of one celestial object
another.
The path along which an object travels during a revolution is called an
Stars and Planets
The solar system is made up of the
.
, and all the
that
travel around it.
The planets are
- we see them because light reflects off them
(they don’t glow).
The sun and stars
- they are called
.
Observing Stars and Planets
We can see
,
Mars, Jupiter, and Saturn without
binoculars
The brightest star we can see is
.
The Difference Between Planets and Stars
Planets o Are
– in our solar system
o Are
than most stars
o Reflect light from the
o Are usually
or
o Are usually made of
or
o Have a steady
o Wander slowly through constellations
Stars
o Are very
, past our solar system
o Are usually
than planets
o Give off their
light
o Are very
o Are made of
temperature gases
o Appear to
o Move
of a constellation