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The Universe, Solar System, and Planets I
The Universe, Solar System, and Planets I

Inner Planets Mercury
Inner Planets Mercury

... Random Info on 2nd website: Venus is the 2nd closest planet to the sun. One day on Venus lasts as long as 243 Earth days (the time it takes for Venus to rotate or spin once). Venus makes a complete orbit around the sun (a year in Venusian time) in ...
evidence found of solar system around nearby star
evidence found of solar system around nearby star

... be inferred by indirect measurements. Their star is so near, however, that some astronomers think that they may be able to see its planets with better telescopes within the next decade. One of the planets, a gas giant 1 { times heavier than Jupiter, was discovered in 2000 by Barbara McArthur , an as ...
`A ship flying in space:` Earth seen through the eyes of an astronaut
`A ship flying in space:` Earth seen through the eyes of an astronaut

... This makes both planets way too hot to support life as we know it. Still, the pace of planet discovery is astonishing. Sometime in the next few years, scientists will likely discover Earth-like planets that are capable of supporting life. Our sun is just one star among the hundreds of billions that ...
Measuring Distances Beyond the Solar System The Characteristics
Measuring Distances Beyond the Solar System The Characteristics

... Light travelling from the Sun distance 0.000016 ly away, takes approximately 8 minutes to reach Earth Light travelling from Vega distance 25 ly takes approximately 25 years to reach Earth. ...
Evidence for Design: Earth & Solar System
Evidence for Design: Earth & Solar System

Early Astronomy
Early Astronomy

... Were the Earth flat they would just get smaller. ...
opposition
opposition

Homework 12 1. How would phases change if the Moon were the
Homework 12 1. How would phases change if the Moon were the

... same size as Earth, but still had the same mass? Both total and partial solar eclipses would be more frequent because there is a greater chance that the larger Moon would block the Sun. The Earth will have more Moon to block, but a bigger target. Their will be more partial lunar eclipses and fewer t ...
Satellite Communication - univ
Satellite Communication - univ

The Planets in the Solar System There are an uncountable number
The Planets in the Solar System There are an uncountable number

... from huge stars to tiny particles of dust. Somewhere between the two extremes are planets. For example, Ida, Jupiter, and Mercury are all big enough to be seen from Earth, but should we classify all three of these objects as planets? This question has made many people wonder: How many planets are th ...
Card Answers #2
Card Answers #2

... Why do the constellations appear to be in different places each night? ...
The Solar System Solar System Today (Not to Scale) Inner Planets
The Solar System Solar System Today (Not to Scale) Inner Planets

... The planets formed by the accretion of planetesimals and the accumulation of gases in the solar nebula ...
Unit 5
Unit 5

... Earth revolves around the Sun in and year and rotates on its axis in a 24-hour day. They have related this rotation of Earth to day and night while recognizing that the movements of the sun, moon, and stars are connected. SC.5.E.5.1: (DOK 1) Recognize that a galaxy consists of gas, dust, and many st ...
Models of the Solar System
Models of the Solar System

Lesson 4d Models of the Solar System
Lesson 4d Models of the Solar System

... The planets can sometimes exhibit retrograde motion over the course of several ...
Astronomy 1400: Exam 3 version 1
Astronomy 1400: Exam 3 version 1

... 19. Why are the inner planets made of denser materials than the outer planets? A. The Sun’s gravity pulled denser materials toward the inner part of the solar nebula, while lighter gases escaped more easily. B. Denser materials were heavier and sank to the center of the nebula. C. In the inner part ...
Science 9 – Space Exploration
Science 9 – Space Exploration

... 13. At the end of the life cycle of a star it explodes in a catastrophic event called a… A. massive B. supergiant C .black hole D. supernova 14. Astronomers are discovering these are more common than first thought. Although they are invisible to observers, using even the most powerful telescopes, As ...
Characteristics of Stars
Characteristics of Stars

... • Astronomers use a unit called the light year to measure distances between the stars • Light travels at a speed of 300,000 km/s • Light year- distance that light travels in one year =9.5 trillion km • Light year=unit of distance ...
Volume 20 Number 5 April 2012 - Forsyth Astronomical Society
Volume 20 Number 5 April 2012 - Forsyth Astronomical Society

... been caused by a cosmic body crashing into Earth nearly 13,000 years ago. Exotic materials in the sediment layer strongly support a belief that a major cosmic impact with Earth coincided with the onset of an unusual cold climatic period. The researchers said they identified an impact form of nanodia ...
Earth Moon Sun System
Earth Moon Sun System

... over a 26,000yr. period. • Axes point in different locations over time. • Changes North/South Stars over time. (Vega, 14,000AD) • This motion, along with changes in eccentricity and obliquity, affect long-term climate change and cause ice ages. (Milankovitch Cycles) ...
b 03 Other Obj in Sol System combo ppt
b 03 Other Obj in Sol System combo ppt

... • when trapped by Earth’s gravity it is pulled through the Earth’s atmosphere • This causes the meteoroid to heat up and vapourize due to the friction with the molecules in the atmosphere which results in a… ...
Name the eight planets in order by increasing distance from the sun:
Name the eight planets in order by increasing distance from the sun:

... A: Hydrogen & Helium exist on these planets in liquid form 6-Which planet spins on its side (>90 degrees)? A: Uranus 7-How do you determine a planet’s day ? How do you determine a planet’s year? A: Day- the rotation around the axis Year- Revolution/Orbit around Sun 8-Which of the geocentric, helioce ...
SUMMARY The Earth is one of eight planets orbiting the Sun, and
SUMMARY The Earth is one of eight planets orbiting the Sun, and

... The Earth is one of eight planets orbiting the Sun, and the Sun is one of about a hundred billion stars that make up the Milky Way Galaxy. The Milky Way, two other similar­size galaxies, and dozens of smaller galaxies compose the Local Group, which in turn is part of?the Local Supercluster of galaxi ...
Characteristics of Stars
Characteristics of Stars

... Characteristics of Stars ...
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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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