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Study Guide I (Chpts 1
Study Guide I (Chpts 1

... sun. It is this tilt that is responsible for the earth’s seasons. (No tilt = no seasons.) The earth spins on its axis once every 24 hrs. The earth revolves in an elliptical orbit around the sun every 365 ¼ days. Earth-sun distance = 150 million km = 1.5 x 1011m. Small difference in distance between ...
Solar System
Solar System

... Some of the asteroids have very elliptical orbits, and some - called the Apollo asteroids - come inside earth’s orbit. We think only a few dozen of the earth-crossing asteroids have sizes greater than 1 km. Another group of asteroids called the Trojan asteroids follow and lead Jupiter by about 60o i ...
Rotation and Revolution of Earth
Rotation and Revolution of Earth

... • Impacts on Earth’s atmosphere due to human activity: – Increasing amounts of greenhouse gas emissions • Increased CO2 from burning fossil fuels • Leading to global warming (more infrared radiation absorbed by atmosphere) • 0.60C global temperature increase over the past century probably due to inc ...
UNIVERSAL GRAVITATION
UNIVERSAL GRAVITATION

... maximum. These are where high tides occur. In between, the tide is low. When the sun and moon line up, either at full or new moon, their tidal effects reinforce and we have a spring tide. When the moon is half full their tidal effects subtract from each other and we have a neap tide. Tidal forces an ...
Objects in the Universe
Objects in the Universe

... close to the sun • Tail always points away from the sun ...
The Sun and Beyond - Valhalla High School
The Sun and Beyond - Valhalla High School

...  Meteors  Asteroid Belt (Mars and Jupiter  Kuiper Belt (Pluto is the king)  Inner (rocky)  Outer (gas giants) ...
3rd Grade Object in the Sky Assessment
3rd Grade Object in the Sky Assessment

pptx
pptx

... The large impact theory is widely believed to be correct. The iron core of the impacting planet could have merged with the Earth’s core, while the Moon formed from crust and mantle thrown into space. This explains why the Moon is similar in composition to the Earth’s crust and mantle, but has as ver ...
Sizing Up The Universe
Sizing Up The Universe

... period of variability by observing a number of them in the Small Magellanic Cloud. They were all at approximately the same distance, so their relative luminosity as a function of their period of variability could be determined. From 1923 to 1924 Edwin Hubble (1889–1953) observed the Andromeda galaxy ...
apparent retrograde motion - Indiana University Astronomy
apparent retrograde motion - Indiana University Astronomy

... ●Sun is at center of the Universe ●Earth orbits the Sun like any other planet ●Earth rotates ●Circular orbits for all planets ●Inferior planet orbits are smaller ●Planets move at constant velocities in their orbits ●Retrograde motion occurs when we “lap” Mars & the other superior planets ...
Planets Beyond the Solar System
Planets Beyond the Solar System

Transit of Venus
Transit of Venus

... during the transit with its known diameter. The comparison will help to estimate the size of exoplanets detected around other stars. • To improve and develope reliable exoplanet detection techniques by measuring the dip in Sun's brightness. The robust models will then help eliminate the false detect ...
Lesson #6: Solar System Model - Center for Learning in Action
Lesson #6: Solar System Model - Center for Learning in Action

... Tell them they can use any notes or sketches they have taken over the past few weeks to help them accurately assemble their diagrams. They can also look at the models they made in the first lesson plan to see what they can do to make their models today more accurate. 2. Tell students that their mode ...
The sun, the earth, and the moon
The sun, the earth, and the moon

...  Earth was therefore formed at the same time  Sun must have been around while earlier ...
chapter2 - Empyrean Quest Publishers
chapter2 - Empyrean Quest Publishers

... and it is summer in the northern hemisphere and winter in the southern hemisphere The summer is hot not only because of the extended daylight hours but also because the Sun is high in the northern hemisphere’s sky As a result, sunlight strikes the ground at a nearly perpendicular angle that heats th ...
Astronomy Club of Asheville July 2016 Sky Events
Astronomy Club of Asheville July 2016 Sky Events

... waxing gibbous Moon appears to glide past the planets Mars and Saturn. The two planets easily outshine the red giant star Antares in the constellation Scorpius. Image courtesy of Sky & Telescope ...
CHAPTER 13: GRAVITATIONAL INTERACTIONS 13.1
CHAPTER 13: GRAVITATIONAL INTERACTIONS 13.1

JANUARY 2011 ASTRONOMY From the Trackman Planetarium at
JANUARY 2011 ASTRONOMY From the Trackman Planetarium at

... On January 3rd, the Earth will be at its closest approach to the sun in our annual orbit. We’ll be 91.4 million miles from our star. We are at the farthest from the sun in July. The sun is slightly brighter and larger in January than in July, but it is only noticeable if we have a solar eclipse. In ...
Life Cycle of Our Sun
Life Cycle of Our Sun

... About 4.6 billion years ago a great swirl of gas and dust some 15 billion miles across in this location in space and began to condense forming our Sun. Virtually 99.9 percent of the mass of our Solar System is the Sun. Our Sun has lived almost 5 billion years of its life and will lived approximat ...
Integrative Studies 410 Our Place in the Universe
Integrative Studies 410 Our Place in the Universe

... – About 1016 m (~6 trillion miles) • Speed of light is 3  108 m/sec or 186,000 mi/sec ...
Full name - IES Santísima Trinidad
Full name - IES Santísima Trinidad

... 4.-RSMA: _ _ _ _ is the fourth planet. it is a small and rocky. People call it the red planet. 5.-TREIPUJ: _ _ _ _ _ _ _ is the fifth planet. It is bright and large. 6.-STRNUA: _ _ _ _ _ _ is the sixth planet in order from the sun. It has got many rings. Its rings are flat and broad. The rings are m ...
Lesson 29
Lesson 29

... There is much information to learn about the planets. It takes Earth one year, 365 days, to complete one orbit around the sun. The planet Mercury takes only 88 days to orbit the sun, since it is closest to the sun; but Pluto takes 248 years. Pluto and Neptune are the coldest planets with temperature ...
Life on Our Evolving Planet
Life on Our Evolving Planet

... 2. The defining property of a system is that it has parts that interact. A closed system does not interact with its environment – an idealized state that is only approximated by systems smaller than the entire universe. In contrast, an open system has energy and/or matter flowing into and/or out of ...
Proof of Earth`s Shape and Size
Proof of Earth`s Shape and Size

... The North Star appears lower and lower in the sky as you travel toward the equator because of earth’s spherical shape, where the North Star is just visible at the horizon. The latitude of the equator is 0°. ...
Our Place in the Universe (Chapter 1) The Structure and Size of the
Our Place in the Universe (Chapter 1) The Structure and Size of the

... Orbits and Rotations of Planets • Interactive figure on “A more accurate model of the solar system” • The orbits and rotations of the planets will reappear in Chapter 7. • They are hard to display on a screen or projector • Today: Orbits of planets are very close to being in the same plane ...
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Rare Earth hypothesis



In planetary astronomy and astrobiology, the Rare Earth Hypothesis argues that the origin of life and the evolution of biological complexity such as sexually reproducing, multicellular organisms on Earth (and, subsequently, human intelligence) required an improbable combination of astrophysical and geological events and circumstances. The hypothesis argues that complex extraterrestrial life is a very improbable phenomenon and likely to be extremely rare. The term ""Rare Earth"" originates from Rare Earth: Why Complex Life Is Uncommon in the Universe (2000), a book by Peter Ward, a geologist and paleontologist, and Donald E. Brownlee, an astronomer and astrobiologist, both faculty members at the University of Washington.An alternative view point was argued by Carl Sagan and Frank Drake, among others. It holds that Earth is a typical rocky planet in a typical planetary system, located in a non-exceptional region of a common barred-spiral galaxy. Given the principle of mediocrity (also called the Copernican principle), it is probable that the universe teems with complex life. Ward and Brownlee argue to the contrary: that planets, planetary systems, and galactic regions that are as friendly to complex life as are the Earth, the Solar System, and our region of the Milky Way are very rare.
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