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... don’t know for sure. What we do know is that habitable zones, as originally conceived, have only peripheral relevance to whether there may be life on a planet within them. ...
Astronomy Assignment #1
Astronomy Assignment #1

... Centrifugal effects caused the outer parts of the nebula to flatten into a disk, while the core of the solar nebula formed the Sun. The planets formed from material in the disk and the Sun was at the center of the disk ...
Brock physics - Brock University
Brock physics - Brock University

... 1. About 2300 years ago, Aristotle argued that the Earth is spherical based on a number of observations, one of which was that (a) the head of Barry Bonds resembled the Earth’s shape more and more as his career progressed. (b) sailors travelling in the same direction eventually always came back to t ...
Lecture6
Lecture6

... A mystery to the ancients (who assumed earthcentered universe!). Important distinction: Diurnal motion: E to W (rise, transit, set), due to earth’s rotation. Motion on the celestial sphere (much slower, W to E “slipping”). ...
Let us calculate planet`s orbit radii and its average orbital
Let us calculate planet`s orbit radii and its average orbital

... Earth velocity of its rotation around axis considerably increased. And axis has turned on 23 relatively to orbital plane. Orbital plane also displaced from an equatorial plane of the sun on 7. In addition the declination of a lunar orbit to an ecliptic makes 5,15, and orbit of Mars 1,85, the sum ...
PHYS178 2008 week 11 part-1
PHYS178 2008 week 11 part-1

... the resulting research paper that has been accepted for publication in the European journal Astronomy & Astrophysics (see below). ...
Chapter 12 (in pdf)
Chapter 12 (in pdf)

... discovery in 1930, and nothing of similar size was discovered for several decades •  Now other large objects have been discovered in Kuiper Belt, including Eris •  The International Astronomical Union (IAU) now classifies Pluto and Eris as dwarf planets ...
Document
Document

... There might be a signal at ~4 d, but the fact that different data sets give different answers makes me doubt this The other two „planets“ are noise → This is not a robust or confirmed planetary system because a different approach gives an entirely different answer! ...
The mystery of cosmic oceans and dunes Earth
The mystery of cosmic oceans and dunes Earth

... planets and their characteristics. Bulk density measurements and multiband spectral data allow planets with Earth-like water contents to be distinguished from ocean or dune planets by future observations. Of the stars observed within 30 light years of the Sun, 60% are less than 0.3 the mass of the S ...
Solar System Webquest
Solar System Webquest

... cloud left by a passing comet, named after constellation they appear in ...
epout10
epout10

... The giant blue planet inspired ancient peoples to name it after the god of the deep blue sea. We know less about Neptune than we do about the other eight planets, although Voyager 2 gave us new information. Pluto Pluto, the ninth and, as far as we know, last planet in our solar system, was predicte ...
View/Open - SUNY DSpace
View/Open - SUNY DSpace

... days to orbit the sun, but it takes Pluto 294 years to make that same trip around the sun. Better technology really came in the year. 1603, when Galileo created the first telescope. With this Galileo found new things out about space such as the moon was not smooth, but had valleys and craters. The m ...
Looking Inside Planets - Laboratory for Atmospheric and Space
Looking Inside Planets - Laboratory for Atmospheric and Space

... Divide the class into 6 to 10 groups. Distribute Planet Interiors data table and assign each group a planet to model. If there are 6-8 groups, omit planets having others of like size (Venus, Saturn, Neptune). For 10 groups, add the Moon. Gather materials. Using a scale of 1 cm = 1000 km, draw a circ ...
Planetary Info Questions
Planetary Info Questions

... 1. When was Mercury identified as a planet? 2. When can it be seen in our sky? 3. When was Mariner 10 launched? 4. Describe Mercury’s characteristics. Read p. 170-173 and answer the following about Venus: 1. Except for the Sun and Moon, ______________ is the brightest object in our night sky. 2. Thi ...
Early Bird Astronomy
Early Bird Astronomy

... Students will identify characteristics of the planets, sun, and moon. • Discuss the special features of the planets in the solar system. ...
A Look at Our Solar System
A Look at Our Solar System

... • Have the students discuss the similarities and differences between the planets. ...
How to Find a Habitable Planet
How to Find a Habitable Planet

... of stabilizing feedbacks between atmospheric CO2 and climate • Bad things happen, though, to planets around stars much different from the Sun --F and A stars: high stellar UV fluxes, short main sequence lifetimes --Late K and M stars: tidal locking, stellar flares, initial volatile inventories? ...
Earth in Space2
Earth in Space2

... Saturn has beautiful rings that are visible from Earth. These rings are made up of chunks of rock and ice, each traveling in its own orbit around Saturn. ...
planetary configurations - Fort Thomas Independent Schools
planetary configurations - Fort Thomas Independent Schools

... Earth has less mass, less inertia, same gravitational force; thus, more easily accelerated ...
Solar System Lesson Plan Grades K-2
Solar System Lesson Plan Grades K-2

Intro to Astronomy
Intro to Astronomy

... they fall toward the sun creating long tails lit up by sunlight. ...
TABLE OF CONTENTS Page Title Date 1
TABLE OF CONTENTS Page Title Date 1

... which changes from Earth size to 3x larger than Earth. 4. Jupiter has approximately 63 moons-Ganymede is slightly larger than Mercury! 5. Jupiter is over 400 million miles away but its gravity protects us, here on Earth, from being struck by asteroids! Saturn (pg 10 11•25•14) 1. Titan, one of Saturn ...
Microlensing
Microlensing

... • Two other multiple systems « in stock », modeling underway. • One has been giving headaches to Bennett since late 2004. • The other one is much further down the road… (Dong et al. 2008) ...
3-The solar system
3-The solar system

... 7-Which of the following is responsible for day and night? A. Earth’s orbit B. Earth’s revolution C. Earth’s rotation D. Earth’s tilt 8 -The imaginary line that passes through the north and south pole of earth is called................................... a-Axis ...
ppt
ppt

... Very few small planets found Remember, Earth’s mass is 318 times less than Jupiters; (Mj) ...
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Definition of planet



The definition of planet, since the word was coined by the ancient Greeks, has included within its scope a wide range of celestial bodies. Greek astronomers employed the term asteres planetai (ἀστέρες πλανῆται), ""wandering stars"", for star-like objects which apparently moved over the sky. Over the millennia, the term has included a variety of different objects, from the Sun and the Moon to satellites and asteroids.By the end of the 19th century the word planet, though it had yet to be defined, had become a working term applied only to a small set of objects in the Solar System. After 1992, however, astronomers began to discover many additional objects beyond the orbit of Neptune, as well as hundreds of objects orbiting other stars. These discoveries not only increased the number of potential planets, but also expanded their variety and peculiarity. Some were nearly large enough to be stars, while others were smaller than Earth's moon. These discoveries challenged long-perceived notions of what a planet could be.The issue of a clear definition for planet came to a head in 2005 with the discovery of the trans-Neptunian object Eris, a body more massive than the smallest then-accepted planet, Pluto. In its 2006 response, the International Astronomical Union (IAU), recognised by astronomers as the world body responsible for resolving issues of nomenclature, released its decision on the matter. This definition, which applies only to the Solar System, states that a planet is a body that orbits the Sun, is massive enough for its own gravity to make it round, and has ""cleared its neighbourhood"" of smaller objects around its orbit. Under this new definition, Pluto and the other trans-Neptunian objects do not qualify as planets. The IAU's decision has not resolved all controversies, and while many scientists have accepted the definition, some in the astronomical community have rejected it outright.
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