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Six Weeks: 3rd ALLEN Subject: Science Grade: 3 TEKS Covering
Six Weeks: 3rd ALLEN Subject: Science Grade: 3 TEKS Covering

... What is the center of our Solar System? What are the planets that make up our Solar System (8) Earth and space. The student knows that there are recognizable patterns in the natural world and among the Sun, Earth, and Moon system. The student is expected to: (A) differentiate between weather and cli ...
lecture 1 - University of Florida Astronomy
lecture 1 - University of Florida Astronomy

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More evidence for ninth planet roaming solar system`s

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Quiz 1 Review

EXOPLANET Due to increasing incursions by hostile alien forces
EXOPLANET Due to increasing incursions by hostile alien forces

... no magnetic field ¹¹ 4 billion years ago Venus had water on its surface, however due to a runaway greenhouse effect, all water evaporated. ¹¹ Atmosphere primarily composed of Carbon Dioxide. Because of this, much of the heat from the sun cannot escape through the thick clouds, and is trapped on the ...
The Earth`s Orbital Velocity
The Earth`s Orbital Velocity

... (spectra) of the star Arcturus (α Boötis) to determine these values. You will also become familiar with the difficulties of making astronomical measurements and the uncertainties in the results. This lab will follow the procedures outlined in the Sky and Telescope reprint entitled "The Earth's Orbit ...
Rocky planets energy budget
Rocky planets energy budget

... For a given value of planetary albedo, the effective temperature of the planet is determined by the insolation and therefore by the planet-star distance, d In this idealized situation, a ring of distances will yield an interval of effective temperatures The concept of “circumstellar habitable zone”, ...
Can you figure out which of the stars shown here have planets
Can you figure out which of the stars shown here have planets

... How do astronomers find planets? Usually by indirect means – like the back-and-forth wobble that an orbiting planet causes in its star – and hardly ever by just taking a picture of the planet. Even then, the best “pictures” we have of other planets are just colored points of light. Astronomers are f ...
The Moon does not fall to Earth because A: It generates a
The Moon does not fall to Earth because A: It generates a

Watch the episode titled “The Milky Way” from the series “The
Watch the episode titled “The Milky Way” from the series “The

... How long does it take Earth to move around the galaxy? About how many galaxies reside in our Local Group? ...
A Comparison of Atmospheric and Chemical Properties of Inner
A Comparison of Atmospheric and Chemical Properties of Inner

... Noble gas measurements on Earth [4-6] and the high-spin Moon-formation scenario [3] shed new light on the origin of Earth’s early atmosphere. Most of the mantle was degassed and most of the outgassed volatiles were lost during the final sequence of giant impacts onto Earth. Earth’s early atmosphere ...
Teacher`s Show Guide
Teacher`s Show Guide

mass extinction kalei and shae
mass extinction kalei and shae

... An extinction event (also known as: mass extinction; extinction-level event (ELE), or biotic crisis) is a sharp decrease in the diversity and abundance of macroscopic life. They occur when the rate of extinction increases with respect to the rate of speciation. Because the majority of diversity and ...
Additional Problems
Additional Problems

... An exotic finish to massive stars is that of a neutron star, which might have as much as five times the mass of our Sun packed into a sphere about 10 km in radius! Estimate the surface gravity on this monster. ...
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Your guide to see five planets after sunset

Section 3: Three Periodicities - Wobble, Tilt, and
Section 3: Three Periodicities - Wobble, Tilt, and

... (The bright streak is a meteor.) Notice how many of the stars at the outer edge of the sky in this photograph seem stretched out? The stretched stars seem to be circling around a stationary bright "central" star to the right of the picture. The bright star is Polaris; because of the rotation of the ...
Review Questions for Chp 2
Review Questions for Chp 2

... 66. Describe the order of the planets during a solar eclipse. 67. Describe the order of the planets during a lunar eclipse. 68. What two astronomical bodies cause the tides? Which is stronger? 69. How does the sun generate energy? 70. What is the formula for generating energy on the sun? 71. What is ...
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... B) The telescopes are above a significant amount of the Earth’s atmosphere C) You do not have to worry at all about the distorting effects of the Earth’s atmosphere D) Gamma-rays from stars can be observed on Mauna Kea E) The telescopes are much close to the objects they will study ...
Trivia Question of the Day
Trivia Question of the Day

...  Created so that each region in the world could have a standard time  24 separate time zones in 15°-wide bans exist ***Challenge Question*** Why 15°-wide bans? Earth rotates 360° in 24 hours, so each 15°-wide ban has a time difference of one hour ...
Name - MIT
Name - MIT

... B) The telescopes are above a significant amount of the Earth’s atmosphere C) You do not have to worry at all about the distorting effects of the Earth’s atmosphere D) Gamma-rays from stars can be observed on Mauna Kea E) The telescopes are much close to the objects they will study ...
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... C) the more luminous are the stars. D) the greater the diameter of the star E) the longer the lifetime on the main sequence 2) What is the biggest advantage of putting a telescope on the Moon than on the Earth? A) The Moon-based telescope will be easier to fix. B) The Moon-based telescope will be mu ...
Kepler`s Laws, Newton`s Laws, and the Search for New Planets
Kepler`s Laws, Newton`s Laws, and the Search for New Planets

... First, the two-body problem applies not only to planets around stars, but also to the motion of binary stars, which are very abundant and also very important in astronomy. In that case, it would be totally incorrect to assume that either one is fixed, but the correct treatment of the earth-sun motio ...
Learning About Stars
Learning About Stars

... planets take less time than Earth to travel around the Sun, while some planets take longer. But this is different than the stars… ...
What Is a Light-year?
What Is a Light-year?

... difficult to understand and use in calculations. For (6) reason, • astronomers use a different (7) of (8) when they talk about distances between stars. In one year, light travels 9.5 trillion km. If there were a star 9.5 (9) km. from Earth, it would take one year for its light to reach us. By the ti ...
α Cen A + iodine cell spectrum - Department of Physics and Astronomy
α Cen A + iodine cell spectrum - Department of Physics and Astronomy

... Results from planet formation simulations by Guedes et al. for α CenB. All simulations yield 1 to 4 Earth-mass planets of which 42% lie inside the star’s habitable zone (dashed lines). The planetary configuration of the solar system is shown for reference. Starting conditions: N lunar-mass bodies in ...
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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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