Studying the Universe

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Studying the Universe

• Part One

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Astronomy

• The study of all physical objects beyond the
  Earth.

Explanation Perhaps it's time to go inside. Such
thoughts might occur to people witnessing the
approach of an impressive shelf cloud. Shelf
clouds are typically seen leading thunderstorms,
although they may precede any well defined front
of relatively cold air. Shelf clouds differ from
roll clouds because shelf clouds are attached to
a larger cloud system lurking above. Similarly,
shelf clouds differ from wall clouds because wall
clouds typically trail storm systems. The above
pictured shelf cloud was photographed toward the
southwest during a trip crossing the prairies of
Saskatchewan, Canada on the Trans-Canada Highway
in 2001 August. A rising Sun illuminated the
impressive cloud from the east as it advanced
from the west.
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Orions Cradle
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Universe

• Consists of all space and matter
• Cosmology is the study of the origin, structure,
  and future of the universe

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Time

• Our calendar is based on the movements of the
  Earth, Sun and Moon.

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Celestial Movements

• Rotate- to spin on an imaginary axis in one
  complete turn.
• Revolution- to move around another body in one
  complete path.

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Which picture demonstrates revolution and
rotation?
A
B
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Year
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Year

• The time it takes the Earth to REVOLVE once
  around the Sun. (365.242 days)

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Moon REVOLVING around Earth
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Month

• roughly the time it takes the moon to REVOLVE
  around the Earth.

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Day

• the time it takes the Earth to ROTATE once on its
  axis.
• A calendar year is 365 days. However, every
  fourth year adds a day to the calendar that makes
  up for the (.242) day to keep the seasons
  occurring in the same months.

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• Astronomers divide the sky into
• The ____ is an imaginary circle created by
  extending the Earth's equator into space.
• To spin around an axis describes what occurance?
• Days are the rotation or revolution around the
  sun?
• What is a year?

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