Science: Space

• The Earth's rotation is it's spinning or turning on its axis.
• The Earth's axis of rotation is tilted by 23.5 degrees.
• The Earth's axis is perpendicular to the plane of its orbit, causing day and night.
• The Earth takes 24 hours to complete a rotation on its axis
• How many poles does the Earth have?

  2
• What are the poles in Earth?

  North Pole and South pole
• The Earth's revolution is its movement around the sun in a fixed, elliptical imaginary orbit.
• The Earth takes a full year or 365 and ¼ days for one complete revolution around the sun.
• The Earth remains tilted while revolving around the sun.
• What are the four seasons on earth?

  Spring, Summer, Autumn (Fall), Winter
• What are the two one-half that faces the sunlight or not?

  Day and night
• When viewed above the north pole, the Earth rotates counterclockwise,from east to west.
• The sun rising everyday in the east.
• The sun setting in the west.
• Why does the sun keep the Earth in orbit around them?

  Because of gravitational forces between the Earth and sun.
• The time when the sun disappears is called sunset.
• The time when the sun appears is called sunrise.
• Perihelion - when the Earth is at its closest point to the sun.
• Aphelion - when it is at its farthest point to the sun.
• An eclipse happens when a planet or a moon gets in the way of the Sun's light.
• What are the two kinds of eclipses?

  Solar eclipse and lunar eclipse
• Solar eclipse - occurs when the moon gets in the way of the sun's light and casts it's shadow on earth.
• When solar eclipse happens?

  ( Day or Night)

  Day
• Lunar eclipse - happens when the Earth gets in the way of the sun's light hitting the moon
• Lunar eclipse - happens when the Earth is between the sun and the moon
• Solar eclipse - happens when the moon is between the sun and the Earth.
• The moon's gravitational pull is the primary tidal force.
• The moon's gravity pulls the ocean toward it during high tides
• In the Northern Hemisphere, the length of the day is longer during the months when it is tilted away from the sun.
• The equator is exactly halfway in between the poles experiencing almost 12 hours a day and 12 hours a night.