chap 7

Any object that exists in space

A scientist who studies space.

The time it takes for an object to orbit another object.Earth's revolution takes 364 ¼ days.

The turning of an object around an imaginary axis running through the centre. Earths rotation takes 24 hours

A group of starts that seem to make a distinct pattern in the sky

The time light travels in a year. Equal to about 9.5 x 1012 

The brightness of a star from perspective on earth.

A constellation inside a constellation or between two or more constellations.

A star or group of stars that point in a certain direction and are used to tell direction.

The rise or fall of the water in the sea due to the gravitational interaction of the moon and the earth.

The monthly progression of changes in the appearance of the Moon that result from different portions of the Moon's sunlight side being visible.

The phenomenon in which the moon appears darkened as it passes into the earth's shadow.

• The Earth's axis is tilted at an angle of 23.5 degrees. This means that the Earth is always "pointing" to one side as it goes around the Sun. When North America is pointing to the sun we are getting direct sunlight this creates hotter temperatures. This
• happens during our summer months.

A celestial body moving in an elliptical orbit around one or more star. Does Not share its orbit with other objects. Inner planet - a planet whose orbit lies within the asteroid belt, i.e., Mercury, Venus, Earth, or Mars. Outer planet - a planet whose orbit lies outside the asteroid belt, i.e., Jupiter, Saturn, Uranus, or Neptune

The movement of a planet from east to west rather than its normal west to east usually due to earth passing this planet in its orbit. 

The average distance between earth and the sun. Equal to 150 x 10 to the power of 6  

The average distance between the sun and an object orbiting the sun.

A model of the solar system stating that the earth is the centre of all planetary motion and the sun and planets orbit the earth in perfect circles.

A model of the solar system stating that the sun is the centre of all planetary motion and the earth and other planets orbit the earth in perfect circles.

An object composed of rocky material, Ice, and gas comes from the Kuiper Belt or Oort Cloud.

An object in space that ranges from a tiny spec like a grain of sand to 500 km wide; most asteroids originate in the asteroid belt between mars and Jupiter.

A piece of rock moving through space.

A meteoroid that enters earth's atmosphere

A meteoroid that enters earth's atmosphere and reaches the ground.

An object that circles the sun beyond neptune.