Presentation on theme: "Astronomy Astronomy the study of the planets, stars, galaxies, and all other objects in space. Horsehead Nebula."— Presentation transcript:
1 AstronomyAstronomy the study of the planets, stars, galaxies, and all other objects in space.Horsehead Nebula
2 Motions of the Earth and Moon Globe – three dimensional model of EarthEarth’s axis is an imaginary line that runs from its North Pole, through its center, to its South Pole.Rotation – each complete counter-clockwise spin around the axis takes about 24 hours (a day)Revolution – Earth moving around the sun (a year) 365 days, 5 hours, 48 minutes, and 46 seconds
3 Earth is tilted at an angle of about 23.5º Earth’s tilt and revolution around the sun produces seasons.Solstices = when Earth is most tilted toward the sunEquinoxes = when Earth is not tilted toward the sun
4 Moon Phases – different shapes that the moon appears to have. The moon goes through 8 phases as it revolves around Earth once every 27.3 days.
6 Lunar Eclipse = Earth casts a shadow on the moon
7 Tides = changes in ocean water levels that take place in a regular pattern. (pull of gravity between moon and Earth.Tides usually change four times each day.
8 Solar System ObjectsSolar System – includes the sun and all objects in space that are affected by the sun’s gravity.
9 Sun-a medium size star-loses energy by emitting light
10 Terrestrial planets – four inner planets having rocky surfaces Mercury, Venus, Earth, and Mars
11 Gas giants – four outer planets that have surfaces made of a kind of slush that forms their gaseous atmospheres. Jupiter, Saturn, Uranus, Neptune
12 Gas giants are larger than the terrestrial planets. Scale model of sizes of planets
13 Moon = a natural satellite Satellite = object that stays in an orbit around a planet
14 Asteroid – large irregularly shaped rocks Comet – mixture of frozen gases and tiny particles of dust (tail points away from sun)Solar wind – particles from the sunMeteor – streak of light formed by a space rock burning up as it plunges into Earth’s atmosphereasteroidComet Hale-BoppMeteor Crater, Arizona