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Download TAKS objective 5 Earth and Space Systems
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STAAR Reporting Category 3 Earth and Space Middle School Science Science STAAR Need to Know STAAR Need to Know 1 Eclipses STAAR Need to Know 2 Solar eclipse When the moon is aligned so that its shadow falls on Earth’s surface, the sun’s light is blocked from reaching part of the Earth. Called solar eclipse because it’s the sun that is being blocked from our view. STAAR Need to Know 3 Lunar Eclipse A lunar eclipse occurs when Earth blocks sunlight from reaching the moon. This puts the moon in Earth’s shadow. STAAR Need to Know 4 Moon phase diagram STAAR Need to Know 5 4 main Phases of the Moon STAAR Need to Know 6 LUNAR CYCLE STAAR Need to Know 7 STAAR Need to Know 8 Moon’s Revolution & Rotation STAAR Need to Know 9 Have you ever noticed that the sun travels lower across the sky in winter than in summer? This is because Earth is tilted on its axis at a 23.5o angle. Seasons During winter part of Earth tilts away from the sun. This causes the sun’s rays to strike that part of Earth at a lower angle than in the summer. STAAR Need to Know 10 EARTH’S REVOLUTION It takes 365 ¼ days for Earth to complete 1 revolution around the sun STAAR Need to Know 11 Seasons- Remember it’s the TILT of the Earth that causes the seasons STAAR Need to Know 12 Winter Solsticeshortest day of the year Days are shorter & nights are longer during winter. This occurs in December in the Northern Hemisphere & in June in the Southern Hemisphere. Each hemisphere receives less sunlight & therefore less heat energy during the winter. This is why temperatures are colder during winter. STAAR Need to Know 13 Summer Solsticelongest day of the year This occurs in June in the Northern Hemisphere and in December in the Southern Hemisphere. Earth’s revolution around the sun causes part of the Earth to tilt toward the sun at different times of the year. This causes that part of the Earth to receive more sunlight at a more direct angle. This is why days are longer and nights are shorter. STAAR Need to Know 14 Equinox- means “Equal Night” Equinox Daytime lasts exactly as long as nighttime on the first day of autumn – the Autumnal Equinox (about September 21) and the first day of spring the Vernal Equinox (about March 21). STAAR Need to Know 15 TYPES OF TELESCOPES Telescopes Type of Radiation Sources of Radiation Optical Visible light Stars, planets, moons To study the size, composition, & movement of starts & galaxies Radio Radio waves Galaxies, stars, black holes To find black holes & map galaxies Ultraviolet Ultraviolet light Distant stars, clouds of dust & gas To map sources & analyze their composition Infrared Infrared light Stars & galaxies To study planets around other stars X-Ray X-Ray Hot gases & exploding stars To study gas clouds 16 between galaxies STAAR Need to Know Some Uses DISTANCES & PROPERTIES IN THE UNIVERSE STAAR Need to Know 17 DISTANCES & PROPERTIES IN THE UNIVERSE Red Shift: moving away & Blue Shift: coming closer STAAR Need to Know 18 Galaxies are groups of millions or billions of stars. The galaxy we live in is the Milky Way galaxy and has over 100 billion stars. It would take 100,000 light years to travel across it! STAAR Need to Know 19 300,000,000 meters per second is the same as 300,000 kilometers per second. That’s the Speed of Light! STAAR Need to Know 20 STAAR Need to Know 21 8 Planets STAAR Need to Know 22 The Sun is a Star Our sun is a medium-size yellow star. It is 4.6 billion years old. In the sun, hydrogen undergoes nuclear fusion, a process that releases vast amounts of energy. During fusion hydrogen atoms join to form helium atoms. Hydrogen fusion is the source of light, heat, and other radiation from the sun. STAAR Need to Know 23 The Sun & Gravity STAAR Need to Know 24 THE BIG BANG THEORY The most widely accepted theory for the formation of the universe. It states that all matter & energy were once packed into a tiny particles smaller than speck of dust. This particle was incredibly hot & dense which suddenly began to expand. Overtime universe cooled & continued to expand. Evidence suggest that big bang took place about 13.7 billions years ago. STAAR Need to Know 25 Comets Comets are made of various solids (like dirt & dust) and ice crystals. When their orbits take them close to the sun, dust and ice heat up to produce a “tail” behind the comet. Larger comets may even become visible without the aid of a telescope. STAAR Need to Know 26 Asteroids Asteroids are rocky and usually follow regular orbits around the sun. Asteroid belt- the area between Mars and Jupiter that contains many asteroids orbiting the sun. STAAR Need to Know 27 Nebulae Nebulae are huge clouds of dust and gas. Some scientists think that our solar system was formed from nebula. STAAR Need to Know 28 LIFE CYCLE OF A STAR Nebula Nuclear Fusion Protostar Main Sequence Red Giant White Dwarf Supernova Neutron Star Black Dwarf Black Hole STAAR Need to Know 29 Closest star to Earth (besides the Sun) Proxima Centauri is the nearest star to our Solar System. Traveling at the speed of light, it would take about 4 years & 3 months to reach it from Earth. (That makes it about 280,000 times farther away from Earth than our sun!) STAAR Need to Know 30 H-R Diagram In the Hertzsprung-Russell diagram each star is represented by a dot. Stars are plotted by their luminosity (brightness) and surface temperature. STAAR Need to Know 31