SPACE

Space

Gravity Gravity is a force that keeps the planets in motion around the sun Gravity acts everywhere in the universe

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Rotation Spin on an axis Causes day and night

Revolution Orbital motion of a planet around the sun 1 year

1 year, 365 days, or 12 months

Rotation or spinning

Moon phases

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Tides

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Seasons December June

2 Which diagram best represents the tilt of Earth’s axis in December?

Ptolemy Earth was the center of the Universe geocentric

Aristotle Geocentric model the planets and stars were perfect spheres but Earth was not thought that the movements of the planets and stars must be circular 

Copernicus Heliocentric Determined Earth rotates on its axis

Galileo Telescope

asteroid a small rocky body orbiting the sun Most are found between Mars and Jupiter

Meteors streak of light in the sky ("shooting star“) produced by the entry of a small meteoroid into the Earth's atmosphere

comet a celestial object consisting of a nucleus of ice and dust and, when near the sun, a “tail” of gas and dust particles pointing away from the sun

moon or moon, is a celestial body that orbits another body

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Rocketry History Sputnik 1957 Explorer 1 1958 Apollo 1967 Apollo 11 1969 first moon landing Space Shuttle –1981 Reusable space craft

Artificial Satellites human-built objects orbiting the Earth and other planets in the Solar System used to study the Earth, other planets, to help us communicate, and even to observe the distant Universe Sputnik 1 Explorer 1 GOES (geostationary) Hubble Space Telescope International Space Station

Missions to the Moon 1959 Luna did a flyby 1969 Apollo 11 landed on the moon 1972 last Apollo mission to the moon

Mars Robotic Exploration Spirit: 2004, studied rocks and minerals to determine if there was ever life on Mars Phoenix Mars Lander: 2008, looking for the presence of water Curiousity: 2012, studied if Mars is suitable for life