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university of british columbia: astronomy 310: final
university of british columbia: astronomy 310: final

... “Name That Planet or Moon”. The rules — name the planet or moon associated with each description. A given planet or moon should be used only once in answering these questions. (a) the planet that has about the same cratering density as the Moon ...
For each statement or question, select the word or expression that
For each statement or question, select the word or expression that

... B. titanium and hydrogen C. hydrogen and helium D. helium and iron ____ 15. Red giants that lose their atmospheres leave faint, Earth-sized stars called A. Cepheid variables B. blue superiants C. white dwarfs D. proton stars ____ 16. Cepheid variable stars have been used to determine the A. ages of ...
Jeopardy
Jeopardy

PSSA Prep Earth History Jeopardy
PSSA Prep Earth History Jeopardy

... H-R diagram shows what information about the stars? • Surface temperature and the absolute magnitude • (remember absolute is compared at same distance, apparent is how bright they appear to be from earth) ...
Jeopardy Review Earth Science
Jeopardy Review Earth Science

... H-R diagram shows what information about the stars? • Surface temperature and the absolute magnitude • (remember absolute is compared at same distance, apparent is how bright they appear to be from earth) ...
Our Solar System PPT
Our Solar System PPT

... Temperature: Hot to warm ...
Solar System Activity - Dialogue 3
Solar System Activity - Dialogue 3

... Temperature: Hot to warm ...
Sun, Stars and Planets [Level 2] 2015
Sun, Stars and Planets [Level 2] 2015



... telescope- a tool that makes objects appear larger. elliptical- an oval/egg shaped orbit. lunar- means moon. Pluto- a former planet that is the smallest and farthest in our solar system. Jupiter- largest planet with large red spot. ...
Our Solar System
Our Solar System

... Our solar system is made up of:  Sun – Star in the center of a solar system.  Nine planets  Their moons – a natural satellite that orbits a primary planet.  Asteroids ...
Sample final
Sample final

... axis? How would you classify (composition or type) this object? In other words, what is it? Essay section part one Choose two of the following discoveries, and determine if they are surprising (not consistent with current astronomical ideas) or not surprising (consistent). In either case, state clea ...
The Earth in the Universe
The Earth in the Universe

... point between two objects where they balance each other. • Its kind of like the center of gravity. • The center of gravity is the point in the middle of all the material that makes up an object, mass. ...
Some facts and concepts to have at your fingertips.
Some facts and concepts to have at your fingertips.

... • A main sequence star converts protons into helium nuclei in its core. 0.7 percent of the mass of the protons is converted into energy according to Einstein’s formula E = m c2 . • The Sun will be a main sequence star for a total of about 10 billion years. • The Sun will eventually become a white dw ...
Instructor Notes
Instructor Notes

...  bigger than Mercury   2nd largest moon in solar system   only moon with a significant atmosphere   organic chemistry in atmosphere  ...
Information and workshee - Athens
Information and workshee - Athens

... 8. Another name for the North Star. 14. A natural satellite that orbits a planet. 16. This second largest planet has a beautiful ring system. 18. The study of the universe. 21. This happens when the moon passes between the earth and sun and blocks sunlight from reaching the earth. 22. A hot, rotatin ...
Space Exam Review
Space Exam Review

Saturn is the only planet in our Solar System less den
Saturn is the only planet in our Solar System less den

... Astronomers are now fairly sure that it happened 15 billion years ago. ...
Name Class Date Our Solar System The solar system consists of our
Name Class Date Our Solar System The solar system consists of our

... (26%). Hot chemical reactions (known as thermonuclear reactions) inside the Sun release enormous amounts of energy, mostly as light and heat. These reactions occur when the hydrogen turns into helium. Earth’s Sun is an average-sized star. The Sun is more than a million times greater in volume than E ...
The “Big Bang” Theory
The “Big Bang” Theory

... Is created when fusion begins ...
Monday – October 29th - East Hanover Township School District
Monday – October 29th - East Hanover Township School District

The Milky Way
The Milky Way

... “an object in the Solar System that orbits the Sun and is not a satellite of a planet or other celestial body. It must be spherical (or nearly so) in shape.” ...
Terrestrial planets
Terrestrial planets

... NEIGHBOURS • The first four planets from the sun are all of the terrestrial planets. Mercury is 77 million km from Earth ...
E. Sci. Astronomy Notes
E. Sci. Astronomy Notes

... Venus has CO2 atmosphere, hottest planet due to greenhouse effect, sister planet to Earth, clockwise rotation (retrograde motion), no moons Earth only planet with water/life, 1 moon ...
Everyday a new Christmas
Everyday a new Christmas

... Milky Way”. Combine that with results from the NASA Keplar study where 4.4% of its candidate planets are in the Goldilocks zone and you have mind-boggling potential for life. Goldilocks, you may remember, liked her porridge not too cold and not too hot. So the Goldilocks zone is the distance from ea ...
NASC 1100 Lecture 1
NASC 1100 Lecture 1

< 1 ... 340 341 342 343 344 345 346 347 348 ... 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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