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Section 26.2 - CPO Science
Section 26.2 - CPO Science

... 26.2 Motion and keeping track of time  The Egyptians adopted a calendar with 365 days in a year, divided into 12 months, each with 30 days, and an extra five days at the end. As early as 3500 BC, monuments called obelisks were built to separate the day into parts. ...
Astronomy Milestone/OAS practice
Astronomy Milestone/OAS practice

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Astronomy in Ancient Cultures
Astronomy in Ancient Cultures

... These are the things ancient cultures could observe, without the aid of technology! (The Sun, Mercury, Venus, Mars, Jupiter, Saturn, Meteors, Comets, and Stars.) Astronomy is the oldest science. There is evidence of crude astronomy even in prehistoric times. Early astronomy was about observing the m ...
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... 1. ________ – glowing ball of _________ held together by its own ___________ and powered by nuclear ____________ at its __________. 2. 300,000 times closer than our next nearest neighbor, Alpha ____________, which is ____ light years away. 3. Our sun is ___ light minutes away from us. B. It is the s ...
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Jupiter-Mars Encounter 17 October 2015

... when it emerged from the morning twilight after passing behind the sun on June 14. In September Jupiter also emerged from its August 28 conjunction behind the sun and joined both Mars and Venus in the morning twilight. At the present time all three of these naked-eye planets are slowly moving eastwa ...
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... seventeen century, observations were made with the naked eye. Nonetheless, with great patience and ingenuity, astronomers were able to chart the motion of many stars and planets across the sky. Tycho Brahe, a Danish astronomer (1546-1601), was credited to have made very careful observations of the m ...
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Our Solar System Study Guide Answers

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Untitled

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Explore the Planets

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because they reflect light from the sun.
because they reflect light from the sun.

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ASTRONOMY 161

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...  The surface is completely reworked by molten material ejected from many active volcanoes found all over the moon. Io has the youngest surface in the solar system.  Due to its lack of an atmosphere, and low gravity, volcanic material spews tens of kilometers above the surface, and rains back down ...
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... Earth and its solar system are part of the Milky Way galaxy, which is one of many galaxies in the universe. ESS1.B: Earth and the Solar System The solar system consists of the sun and a collection of objects, including planets, their moons, and asteroids that are held in orbit around the sun by its ...
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Stars Answers - Science Skool!

... Dust and gas is pulled together by gravity 8. What happens to massive stars after the red super giant stage? Outer layers are thrown into space which scatters gas and dust into space and distributes the elements throughout space. The core left behind forms a neutron star or black hole if sufficient ...
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planets - MrPetersenScience

... • The greenhouse effect on Venus makes the average surface temperature ______°C, a phenomenon commonly referred to as a ____________ greenhouse effect. • Sulfur dioxide droplets in Venus’s upper atmosphere form a cloud layer that __________ sunlight. The cloud layer reflects the sunlight so strongly ...
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... rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared its ...
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Formation and evolution of the Solar System



The formation of the Solar System began 4.6 billion years ago with the gravitational collapse of a small part of a giant molecular cloud. Most of the collapsing mass collected in the center, forming the Sun, while the rest flattened into a protoplanetary disk out of which the planets, moons, asteroids, and other small Solar System bodies formed.This widely accepted model, known as the nebular hypothesis, was first developed in the 18th century by Emanuel Swedenborg, Immanuel Kant, and Pierre-Simon Laplace. Its subsequent development has interwoven a variety of scientific disciplines including astronomy, physics, geology, and planetary science. Since the dawn of the space age in the 1950s and the discovery of extrasolar planets in the 1990s, the model has been both challenged and refined to account for new observations.The Solar System has evolved considerably since its initial formation. Many moons have formed from circling discs of gas and dust around their parent planets, while other moons are thought to have formed independently and later been captured by their planets. Still others, such as the Moon, may be the result of giant collisions. Collisions between bodies have occurred continually up to the present day and have been central to the evolution of the Solar System. The positions of the planets often shifted due to gravitational interactions. This planetary migration is now thought to have been responsible for much of the Solar System's early evolution.In roughly 5 billion years, the Sun will cool and expand outward many times its current diameter (becoming a red giant), before casting off its outer layers as a planetary nebula and leaving behind a stellar remnant known as a white dwarf. In the far distant future, the gravity of passing stars will gradually reduce the Sun's retinue of planets. Some planets will be destroyed, others ejected into interstellar space. Ultimately, over the course of tens of billions of years, it is likely that the Sun will be left with none of the original bodies in orbit around it.
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