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Science 9 Test Review-Space Answers 1. pg 434 2a
Science 9 Test Review-Space Answers 1. pg 434 2a

... Axis – an imaginary straight line between the north and south pole Orbital period – the period of time required for an orbiting object to complete one revolution Constellations – a group of stars that forms shapes or patterns Probe – an unmanned space craft sent into space to obtain data and complet ...
Integrative Studies 410 Our Place in the Universe
Integrative Studies 410 Our Place in the Universe

Astronomy Final Exam Review
Astronomy Final Exam Review

... • Light year- the distance light travels in a year • AU-(astronomical unit)- 1AU= distance from Earth to the sun ...
Regents Review Questions.Unit 2.Astronomy
Regents Review Questions.Unit 2.Astronomy

... 15 Describe the relationship between the distance from the Sun and the period of revolution for these four planets. Astronomers have discovered more than 400 planets outside of our solar system. The first extrasolar planet was detected in 1995 orbiting a star known as 51 Pegasi, which is similar in ...
Early history of astronomy
Early history of astronomy

... The difference between a solar day and a sidereal day ...
DOC
DOC

... When our part of the Earth moves around so it is lit by the sun. The path an object takes around another object in space. A shape like a ball. A system of planets which revolve around a star (or sun) ...
19.3 Notes
19.3 Notes

... In 1687, Isaac _____________ explained that the force that keeps planets in orbit around the sun, and satellites in orbit around planets is _________________. His theory also states that every object in the universe exerts a gravitational ____________ on every other object. Newton was the first to p ...
practice exam #1
practice exam #1

... 22. Which type of spectrum is most often used to determine the composition of a star? a. Dark-line b. Bright-line c. Continuous d. All of the above 23. The constellation Orion contains a red star and a blue star. Which star is hotter? ____________ 24. If Star A is 10 times hotter than Star B, then S ...
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Document

Our Universe - Etiwanda E
Our Universe - Etiwanda E

... A piece of rock made up of material similar to a planet.  Most asteroids are between the orbits of Mars and Jupiter captured by gravity.  Some asteroids are the moons of planets. ...
Seasons
Seasons

... Billions of years ago, before there was life on Earth, a planet about the size of Mars smashed into us. It knocked the Earth over, so instead of rotating around an axis that is straight up and down, we are tilted by ...
Natural Science 9: Test Review-Space Answers 1. pg 434 #2 a – i a
Natural Science 9: Test Review-Space Answers 1. pg 434 #2 a – i a

... j. Briefly describe a probe? An unmanned space craft sent into space to do research Why are probes sent to other planets and moons? to research, look for signs of life, send back data to earth for our use etc. Why are probes usually unmanned? Due to the amount of time it takes a probe to get to some ...
Conjunctions an Oppositions
Conjunctions an Oppositions

... Sometimes an inferior planet will rise and set before the Sun. You can only see it in the morning before Sunrise …A “morning star” At other times it will rise and set later than the Sun. It can then be seen only in the evening for a short time after sunset … an “evening star” ...
Conjunctions an Oppositions
Conjunctions an Oppositions

... Sometimes an inferior planet will rise and set before the Sun. You can only see it in the morning before Sunrise …A “morning star” At other times it will rise and set later than the Sun. It can then be seen only in the evening for a short time after sunset … an “evening star” ...
The Sun
The Sun

... The asteroid belt is the region of the Solar System located roughly between the orbits of the planets Mars and Jupiter. ...
Solar System Basics 1 - Usk Astronomical Society
Solar System Basics 1 - Usk Astronomical Society

What do we see in the night sky - Laureate International College
What do we see in the night sky - Laureate International College

... Sun which means that they move in an orbit around the sun. Most planets also have _________ that orbit around them. The sun, planets, moon, and other objects that orbit the sun make up the ____________________. ...
Solar System Study Guide 1
Solar System Study Guide 1

... Gas giants – Planets which are large spheres made up mostly of gases – for example Jupiter, Saturn, Uranus, and Neptune. telescope – A device people use to observe distant objects with their eyes. space probe – An unscrewed space vehicle that carries cameras, instruments, and other research tools. ...
The Planet with Three Suns
The Planet with Three Suns

... The strange new world was discovered orbiting a star in a triple star system. That means its parent star orbits alongside two other stars. This makes sunrises and sunsets something special — sometimes one sun rises in the sky, sometimes it’s two or three! But despite this, this planet is not entirel ...
Beautiful Venus - The Evening Star
Beautiful Venus - The Evening Star

... On Saturday morning, April 4th there will be a Total Eclipse of the Full Moon observable from Arizona. Its totality phase will be the shortest of the 21st century lasting only five minutes. The Moon will be located low in the west before sunrise to the right of the bright star Spica. Partial Phase b ...
Today`s Powerpoint
Today`s Powerpoint

... A line connecting the Sun and a planet sweeps out equal areas in equal times. ...
Table of Facts - Portfolio using Bloom`s Revised Taxonomy
Table of Facts - Portfolio using Bloom`s Revised Taxonomy

... The Earth’s surface is very young The Earth is divided into several layers which have distinct properties 71% of the Earth’s surface is covered in water Earth has eight major plates There are also 20 more smaller plates ...
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... • What about the development of intelligence? • Many anthropologists think intelligence is favored by natural selection and closely linked to language. • Cultural evolution on Earth began around 10,000 years ago. ...
Section 14.3 The Inner Planets
Section 14.3 The Inner Planets

... The four inner planets are small and have rocky surfaces They are also known as the terrestrial planets The four inner planets are Mercury, Venus, Earth, and Mars ...
SMART Notebook
SMART Notebook

< 1 ... 353 354 355 356 357 358 359 360 361 ... 373 >

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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