A Walk through the Universe
... yellow card 1 m in diameter. Since even A0 paper is less than 1 m wide, you'll probably need to make two half circles and tape them together. This means you can fold the thing in half, which makes it more portable. The planets On a scale of Sun = 1, the diameters of the planets are as follows: Mercu ...
... yellow card 1 m in diameter. Since even A0 paper is less than 1 m wide, you'll probably need to make two half circles and tape them together. This means you can fold the thing in half, which makes it more portable. The planets On a scale of Sun = 1, the diameters of the planets are as follows: Mercu ...
PH109 Exploring the Universe, Test 3, Fall 2001 Please indicate the
... PH109 Exploring the Universe, Test 3, Fall 2001 Please indicate the best answer to the following questions on the answer sheet provided. 1. Magnetic fields inside sunspots are __________ those in surrounding regions. a) much stronger than, b) slightly stronger than, c) the same as, d) much weaker th ...
... PH109 Exploring the Universe, Test 3, Fall 2001 Please indicate the best answer to the following questions on the answer sheet provided. 1. Magnetic fields inside sunspots are __________ those in surrounding regions. a) much stronger than, b) slightly stronger than, c) the same as, d) much weaker th ...
(a) Satellite A is
... once on its axis 1 mark or orbits at the same speed as the Earth rotates (do not allow simply “same speed as Earth”) (credit satellite must be at exactly the right height (and speed)) NB also credit the responses if given in (i) (iii) communications / TV /telephone calls 3 1 mark (b) (i) monitoring/ ...
... once on its axis 1 mark or orbits at the same speed as the Earth rotates (do not allow simply “same speed as Earth”) (credit satellite must be at exactly the right height (and speed)) NB also credit the responses if given in (i) (iii) communications / TV /telephone calls 3 1 mark (b) (i) monitoring/ ...
Brightness vs. Distance
... amount of Power (Energy/sec) emitted by the star. Unit: WATT The BRIGHTNESS of a star is the amount of that Energy that lands on a square meter of Earth every second. Unit: WATT/m2 ...
... amount of Power (Energy/sec) emitted by the star. Unit: WATT The BRIGHTNESS of a star is the amount of that Energy that lands on a square meter of Earth every second. Unit: WATT/m2 ...
Stars
... The Nebula Hypothesis The solar system (planets, satellites, asteroids, comets, etc.) formed along with the Sun 4.5 Byr ago from the gravitational collapse of an interstellar cloud of gas and dust. The planets and Sun formed from the same reservoir of interstellar matter and are therefore composed ...
... The Nebula Hypothesis The solar system (planets, satellites, asteroids, comets, etc.) formed along with the Sun 4.5 Byr ago from the gravitational collapse of an interstellar cloud of gas and dust. The planets and Sun formed from the same reservoir of interstellar matter and are therefore composed ...
Chapter 2
... To predict a body’s motion we need understand the force acting on it For astronomical bodies this is Gravity Newton’s Law of Gravity states • “Every mass exerts a force of attraction on every other mass. The strength of the force is directly proportional to the product of the masses divided by the s ...
... To predict a body’s motion we need understand the force acting on it For astronomical bodies this is Gravity Newton’s Law of Gravity states • “Every mass exerts a force of attraction on every other mass. The strength of the force is directly proportional to the product of the masses divided by the s ...
Characteristics of the planets in the Solar System
... area beyond the immediate solar system with objects made mostly of ice and rock. It was predicted that as many as 50 Pluto-size objects and large may exist in this belt, so when not one, but two objects larger than Pluto were discovered, it was decided to re-define what a planet is, because the alte ...
... area beyond the immediate solar system with objects made mostly of ice and rock. It was predicted that as many as 50 Pluto-size objects and large may exist in this belt, so when not one, but two objects larger than Pluto were discovered, it was decided to re-define what a planet is, because the alte ...
Lecture04
... Earth’s rotation • Responsible for our familiar calendar “day”. • Period (of rotation) = 24 hours = (24 hours)x(60 min/hr)x(60s/min) =86,400 s • Astronomers refer to this 24 hour period as a mean solar day (§2-7), implying that this time period is measured with respect to the Sun’s position on the ...
... Earth’s rotation • Responsible for our familiar calendar “day”. • Period (of rotation) = 24 hours = (24 hours)x(60 min/hr)x(60s/min) =86,400 s • Astronomers refer to this 24 hour period as a mean solar day (§2-7), implying that this time period is measured with respect to the Sun’s position on the ...
Working with the Illinois Learning Standards: A Constructivist
... Stars evolve much as animals evolve. The source of energy of the stars is unknown. As stars shrink due to gravity, they change from red to blue. Red stars are hot; blue stars are cool. Stars are all roughly the same size. Stars change little over their life spans. Stars can only last thousands or mi ...
... Stars evolve much as animals evolve. The source of energy of the stars is unknown. As stars shrink due to gravity, they change from red to blue. Red stars are hot; blue stars are cool. Stars are all roughly the same size. Stars change little over their life spans. Stars can only last thousands or mi ...
Two Dissipating Exoplanet Atmospheres Taken from: Hubble
... Two Dissipating Exoplanet Atmospheres Many hundreds of large Jupiter-like planets are known to orbit other stars. These extrasolar planets, or exoplanets, are almost always invisible, even to Hubble. This is because their immense distances from Earth make them extremely faint and easily lost in the ...
... Two Dissipating Exoplanet Atmospheres Many hundreds of large Jupiter-like planets are known to orbit other stars. These extrasolar planets, or exoplanets, are almost always invisible, even to Hubble. This is because their immense distances from Earth make them extremely faint and easily lost in the ...
The most important questions to study for the exam
... relative to one another. Why then, do we not see the patterns made up by them, the constellations, changing night by night? • The stars in each constellation are part of a "moving group," all moving the same direction, so their position relative to each other does not change. • The stars in the sky ...
... relative to one another. Why then, do we not see the patterns made up by them, the constellations, changing night by night? • The stars in each constellation are part of a "moving group," all moving the same direction, so their position relative to each other does not change. • The stars in the sky ...
Star Formation: Interstellar Gas and Dust
... What types of planets are out there? • Current search methods Î easiest to detect giant planets close to parent star. • But…why do giant planets exist at less than 1 AU? – spiraling into the star, as a result of friction. ...
... What types of planets are out there? • Current search methods Î easiest to detect giant planets close to parent star. • But…why do giant planets exist at less than 1 AU? – spiraling into the star, as a result of friction. ...
The Copernican Revolution
... one moon. Both planets closer to the Sun than Earth have no moons. Comets orbit the Sun also. They are dirty icebergs (or icy dirtballs) orbiting along extremely stretched-out (meaning, highly eccentric) ellipses. Many of the comets we see as they pass near the Sun take many thousands of years to ...
... one moon. Both planets closer to the Sun than Earth have no moons. Comets orbit the Sun also. They are dirty icebergs (or icy dirtballs) orbiting along extremely stretched-out (meaning, highly eccentric) ellipses. Many of the comets we see as they pass near the Sun take many thousands of years to ...
Lec37
... Kepler tried long and hard to find a circular orbit around the Sun that would match Brahe’s observations of Mars. Up to that time everyone from Ptolemy to Copernicus believed that celestial objects moved in circular paths of one sort or another. Though the orbit of Mars was exasperatingly close to ...
... Kepler tried long and hard to find a circular orbit around the Sun that would match Brahe’s observations of Mars. Up to that time everyone from Ptolemy to Copernicus believed that celestial objects moved in circular paths of one sort or another. Though the orbit of Mars was exasperatingly close to ...
Chapter 7
... Evidential Clues from the Data 1. A successful theory must be able to explain the following data: (a) All the planets revolve around the Sun in the same direction, and all planetary orbits are nearly circular (except for Pluto). (b) All of the planets lie in nearly the same plane of revolution. (c) ...
... Evidential Clues from the Data 1. A successful theory must be able to explain the following data: (a) All the planets revolve around the Sun in the same direction, and all planetary orbits are nearly circular (except for Pluto). (b) All of the planets lie in nearly the same plane of revolution. (c) ...
Review questions with attached answer key
... 2) Earth rotates on its axis 3) stars orbit around Earth 4) stars revolve around the center of the galaxy 6. In New York State, the constellation Pisces can be seen in the night sky between the middle of summer and the middle of winter. The constellation Scorpio can be seen in the night sky between ...
... 2) Earth rotates on its axis 3) stars orbit around Earth 4) stars revolve around the center of the galaxy 6. In New York State, the constellation Pisces can be seen in the night sky between the middle of summer and the middle of winter. The constellation Scorpio can be seen in the night sky between ...
SO FAR:
... • LSR is point instantaneously centered on Sun, but moving in a perfectly circular orbit. • Solar motion: motion of sun relative to LSR ...
... • LSR is point instantaneously centered on Sun, but moving in a perfectly circular orbit. • Solar motion: motion of sun relative to LSR ...
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.