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Your Birthday on Another Planet
Your Birthday on Another Planet

... the Sun. If we could live on another planet, our birthdays would occur more or less frequently depending on the planet’s revolution period (the time taken to complete one full trip around the Sun). On a few planets, we couldn’t even celebrate our first birthday because we wouldn’t live long enough t ...
Solar System, Galaxy, and Universe (ES) V.4
Solar System, Galaxy, and Universe (ES) V.4

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night watch - Warren Astronomical Society
night watch - Warren Astronomical Society

... Pluto will reach perihelion, its closest possible distance from the Sun in 1989. Its orbit is so eccentric that for many years at the end of this century, up to 1998, the planet will be on the part of its orbit that is inside the orbit of Neptune. So in a sense, Pluto will be the eighth planet for a ...
Impossible planets.
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... Everybody was more or less happy with this story until 51 Peg and its weird planet came along. How could a giant planet form so close to a star without being sucked in by gravity? And where did all that dust and gas come from anyway? Right up against the blast of a strong stellar wind, there shouldn ...
ASTR2050 Intro A&A NAMES:  ____________________ ____________________ Work sheet
ASTR2050 Intro A&A NAMES: ____________________ ____________________ Work sheet

... Build a scale model of the solar system, including the sizes and orbital radii of the sun and planets. Most of the data you need can be found in Kutner, Appendices B and D, and Figure 17.3. Show the units in the following lists. 1. What celestial object did you use to set the scale, and what did you ...
PLANETARY MOTION
PLANETARY MOTION

... procedure of data points to a linear relation. The use case is therefore suggested for students at college level. ...
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... procedure of data points to a linear relation. The use case is therefore suggested for students at college level. ...
Overview - School District of La Crosse
Overview - School District of La Crosse

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Earth Science SOL Review Sheet #1
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Solar System Teacher Tips
Solar System Teacher Tips

...  Debate continues concerning the necessity of the “Dwarf Planet” category. Some advocate dwarf planets be classified as planets or asteroids. ...
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level 1

... Challenge - This is designed to require critical thinking skills and stretch students to reason with math and data to come to conclusions. They are matched up with one of the Common Core Standards for Mathematical Practice. These activities work well with students in pairs or small groups where they ...
The planets in the solar system
The planets in the solar system

... other similar effects. Thereafter there still may be many proto-planets orbiting the star or each other, but over time many will collide—either to form a single larger planet or release material for other larger proto-planets or planets to absorb. Some objects in space are a spherical shape because ...
02 - University of New Mexico
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... • Inferior planets never too far from Sun • Superior planets not tied to Sun; exhibit retrograde motion • Superior planets brightest at opposition ...
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... *Most comets are found in one of two regions: 1. Kuiper belt: doughnut-shaped region that extends from beyond Neptune's orbit to 100 times Earth's distance from the sun 2. Oort Cloud: spherical region of comets that surrounds the solar system out to more than 1,000 times the distance between Pluto a ...
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... because they were based on wrong “first principles”, believed to be “obvious” and not questioned: 1. Geocentric Universe: Earth at the Center of the Universe. 2. “Perfect Heavens”: Motions of all celestial bodies described by motions involving objects of “perfect” shape, i.e., spheres or circles. ...
the young astronomers newsletter
the young astronomers newsletter

... star in Hercules, a distance of 95 light years. This signal lasted for just 2 seconds, but is of special interest because the star, HD 164595, is of a class similar to our sun, and it has an exo planet orbiting it (but very close to the star, and presumably, very hot). The Russian astronomers did no ...
Solar System Bead Distance Primary Audience
Solar System Bead Distance Primary Audience

... Our Solar System is immense in size by normal standards. We think of the planets as revolving around the Sun, but rarely consider how far each planet is from the Sun. Furthermore, we fail to appreciate the even greater distances to the other stars. Astronomers use the distance from the Sun to the Ea ...
original talk (9 Mbyte) - The Royal Observatory, Edinburgh
original talk (9 Mbyte) - The Royal Observatory, Edinburgh

... • It does not make heat by nuclear reactions • It is (more-or-less) spherical. • It is bigger than 1000km in diameter ...
Fig. 16-7, p.363
Fig. 16-7, p.363

... from a disk around the Sun as it formed; such protoplanetary disks are seen around many young stars • Planets like Earth are believed therefore to form as normal byproducts of stars forming • There are two types of planets in our solar system, Earth-like and Jupiter-like, results of a process we thi ...
PPT - El Camino College
PPT - El Camino College

... Major criteria necessary in a formation model • Motions – counterclockwise, almost circles, and in same disk (flat) • Two types of planets: – Terrestrial – small, rocky & metallic, near the Sun & close together – Jovian – large, gaseous, far away & far apart ...
Planetary Motions - LathamWHS13-14
Planetary Motions - LathamWHS13-14

...  Direction of axis pointing changes every 13,000 years (cycle is 26,000)  Polaris vs. Vega ...
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IAU definition of planet



The definition of planet set in Prague in 2006 by the International Astronomical Union (IAU) states that, in the Solar System, a planet is a celestial body which: is in orbit around the Sun, has sufficient mass to assume hydrostatic equilibrium (a nearly round shape), and has ""cleared the neighborhood"" around its orbit.A non-satellite body fulfilling only the first two of these criteria is classified as a ""dwarf planet"". According to the IAU, ""planets and dwarf planets are two distinct classes of objects"". A non-satellite body fulfilling only the first criterion is termed a ""small Solar System body"" (SSSB). Initial drafts planned to include dwarf planets as a subcategory of planets, but because this could potentially have led to the addition of several dozens of planets into the Solar System, this draft was eventually dropped. The definition was a controversial one and has drawn both support and criticism from different astronomers, but has remained in use.According to this definition, there are eight planets in the Solar System. The definition distinguishes planets from smaller bodies and is not useful outside the Solar System, where smaller bodies cannot be found yet. Extrasolar planets, or exoplanets, are covered separately under a complementary 2003 draft guideline for the definition of planets, which distinguishes them from dwarf stars, which are larger.
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