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Introduction
Planets
Stars
Asteroids
Comets
Meteoroids, Meteors, and Meteorites
Astronomical objects or celestial objects are naturally
occurring physical entities, associations or structures that
current science has demonstrated to exist in the observable
universe. The term astronomical object is sometimes used
interchangeably with astronomical body. Typically an astronomical
(celestial) body refers to a single, cohesive structure that is bound
together by gravity .
Examples are:
Planets
Stars
Asteroids
Comets
Meteoroids, Meteors and Meteorites
• A planet is a celestial body orbiting a star or stellar
remnant that is massive enough to be rounded by
its own gravity, is not massive enough to
cause thermonuclear fusion, and has cleared its
neighbouring region of planetestimals.
The
term
planet
is
ancient,
with
ties
to history, science, mythology, and religion.
• A star is a massive, luminous sphere of plasma held
together by gravity. The nearest star to Earth is
the Sun, which is the source of most of the energy on
the planet. Historically, the most prominent stars on
the celestial sphere were grouped together
into constellations and asterisms, and the brightest
stars gained proper names.
Asteroids
• Asteroids are small
solid objects that
orbit the Sun.
• They are sometimes
called minor planets.
• The Asteroid Belt is
located
between
Mars and Jupiter is
made up of 5,000
asteroids.
Interesting Facts….
• The
average
daytime
temperature on an asteroid is
212 degrees Fahrenheit.
• The
average
nighttime
temperature on an asteroid is –
238 degrees Fahrenheit.
• Asteroids have large craters on
them.
• The really big asteroids have
moons.
• In 1908 a fireball exploded into
Siberia destroying an ancient
forest and killing a herd of
reindeer
• A comet is like a big
dirty snowball made
out of water , dust
and many different
gases.
• A comet can travel
up to 100,000 m.p.h.
Parts of a Comet
• The three parts of a
comet
are
the
nucleus, the coma,
and the ion tail.
• The tail of the comet
always points away
from the sun this is
because of the strong
solar winds.
•This is the difference between asteroids and comets.
• Meteoroids are small pieces
of dust and rock that are
found in space.
• Meteors are meteoroids that
reach the atmosphere.
• Meteorites are meteors that
reach Earth.
• Meteors are actually
debris from comets.
• Meteors travel 71
kilometers per second
that’s 2,663 times as
fast as a Randy
Johnson fastball.
THE END
By : Kunal Bhasin
Avnish Goyal
Himanshu Arora
Himanshu Khandelwal