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Diapozitivul 1
Diapozitivul 1

... that survives impact with the Earth's surface ...
What Makes a Planet Habitable?
What Makes a Planet Habitable?

... larger than the entire solar system. Dust particles coagulate in disks to ever larger grains and accrete the smaller particles, to eventually form bodies with sizes of hundreds to thousands of kilometers. In the course of this growth, they also attract large gas masses from the surrounding disk by t ...
Extreme Tidal Waves in Binary Star Systems
Extreme Tidal Waves in Binary Star Systems

... synchronize systems such as J0651. Furthermore, the heat produced by this ringing can reignite thermonuclear fusion within the stars, causing them to erupt in a violent outburst called a nova. In addition to binary white dwarf systems, the effects of tides have important implications for newly disco ...
asteroids, comets - MSU Solar Physics
asteroids, comets - MSU Solar Physics

... •  Its radius and mass are not accurately known - it is so small even HST does not view it well. Pluto-Charon binary by HST: they are apart by only 0.9” ...
L11 Terrestrial planet formation and Impacts
L11 Terrestrial planet formation and Impacts

... eccentricities are required in order to allow for further collisions. In the following figure taken from a paper by Chambers and Wetherill (1999) the fraction of the final mass of the planets in different radial bins (0-1 AU, 1-2 AU, 2-3 AU) is plotted as a function of the initial radius of the embr ...
the outer planets
the outer planets

... Draw two more circles for bigger and biggest, but do not write the words inside of them. Ask the students which circle should be labeled “bigger” and which should be labeled “biggest”. Write the words in the circles as the students answer. 5. Ask students to work in groups of two or three, and to br ...
Elliptic Orbits
Elliptic Orbits

... However, that is not the whole story: what if a rogue planet comes flying towards the Solar System from outer space? What kind of orbit will it follow as it encounters the Sun’s gravity? In fact, our analysis of the equations of motion is equally valid in this case, and the ( r , θ ) equation is the ...
May 2017 - What`s Out Tonight?
May 2017 - What`s Out Tonight?

... An Open Cluster is a group of several to hundreds of stars The planets are best observed with a telescope using magnifithat were born out of the same nebula cloud. A group often forms cations from 50x to 200x. The five naked-eye planets are Mera pretty pattern. The Pleiades and Praesepe are great ex ...
Review of "Man`s Place in Nature" by Alfred Russel Wallace
Review of "Man`s Place in Nature" by Alfred Russel Wallace

... three times that of the next higher. Now if this rate of increase be continued down to the seventeenth magnitude there will be about 1,400,000,000 visible. In the best modern telescopes, telescopic observation and photographic charts show nothing approaching this number. The latest estimate does no ...
Homework #3 Solutions
Homework #3 Solutions

... deposits that appear to have been created by once flowing water, consequently showing that it was important at one time. However, due to the loss of some of Mars’s atmosphere, all or most of the surface water boiled away. Currently, some water can still be found in the polar ice caps and also perhap ...
CHAPTER 20
CHAPTER 20

... Triton in 1989, scientists have noticed an interesting trend in Triton’s atmosphere. Images from the Hubble Space telescope taken in 1998 indicate that Triton is going through a rapid period of global warming. As Triton warms, Frozen nitrogen on its surface melts and contributes nitrogen gas to its ...
The Night Sky This Month - Usk Astronomical Society
The Night Sky This Month - Usk Astronomical Society

... Venus is in the west in the evening twilight throughout the month and is unfavourable. Mars is just west of south at dusk throughout this month and is poorly placed for observation. In the first days of the month, however it makes a near-equilateral triangle with Saturn and Antares, but low down. Ju ...
CHAPTER 20
CHAPTER 20

... Triton in 1989, scientists have noticed an interesting trend in Triton’s atmosphere. Images from the Hubble Space telescope taken in 1998 indicate that Triton is going through a rapid period of global warming. As Triton warms, Frozen nitrogen on its surface melts and contributes nitrogen gas to its ...
May - Hawaiian Astronomical Society
May - Hawaiian Astronomical Society

The Big yellow missing variable in the climate
The Big yellow missing variable in the climate

Constructing the Solar System: A Smashing Success!
Constructing the Solar System: A Smashing Success!

... Asteroids are bodies that formed in the early Solar System, and are likely to represent planetesimals that survived the period of planet building and are still in orbit around the Sun today. Most asteroids are found in orbits between Mars and Jupiter (although some are on Earth-crossing orbits, and ...
The Sun
The Sun

... constantly changing. Every eleven years, the Sun goes through a solar cycle, which causes an increase in its magnetic activity. Scientists can see this activity by observing dark spots on the Sun’s surface known as sun spots. Solar flares are explosions on the Sun’s surface. These flares usually occ ...
THE SUN IS NOT AN AVERAGE STAR Sometimes biblical creation
THE SUN IS NOT AN AVERAGE STAR Sometimes biblical creation

Neptune discovery in physics class: activities and simulations
Neptune discovery in physics class: activities and simulations

... Introduction: Orbits of Planets Kepler's laws of planetary motion are three scientific laws describing orbital motion, each giving a description of the motion of planets around the Sun (1619). Kepler's laws are: 1. The orbit of every planet is an ellipse with the Sun at one of the two foci. 2. A li ...
Life in the Universe - University of Georgia
Life in the Universe - University of Georgia

4th grade Stars and Planets Lab - New Prospect Elementary School
4th grade Stars and Planets Lab - New Prospect Elementary School

... Brainstorm with students… You are studying lots of things about space in your classroom. Let’s see what you can tell me about what you have learned: (Just use two or three of these questions as time allows.) 1. What is our closest star? (the sun) 2. What is in the center of our solar system? (the su ...
Cosmic Distance Ladder
Cosmic Distance Ladder

How the Rotation of Earth Affects Our Life
How the Rotation of Earth Affects Our Life

... As earth moves along its orbit, we face the sun from a different perspective and we view different areas of space at night. Most of the constellations we can see in the summer are not visible in the night sky during the winter. This is evidence that Earth has changed locations in space! ...
Alien_Skies_CHAPTER5
Alien_Skies_CHAPTER5

... Kronos into swallowing a stone instead. In due course, Zeus grew up to lead a revolt of the gods against his father. As for Uranus, he was Kronos’s father and the god of the sky itself. So the story goes that Uranus and Gaia were the parents of Kronos (and many others), who in turn fathered Zeus (am ...
The First Thousand Exoplanets
The First Thousand Exoplanets

... smallest exoplanets yet detected orbiting a red dwarf very similar to Barnard’s Star. In 1988, Bruce Campbell and his collaborators published radial velocity evidence of a planetary companion to Gamma Cephei, though they used cautious language in their paper (Campbell et al. 1988). The interpretatio ...
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Orrery



An orrery is a mechanical model of the solar system that illustrates or predicts the relative positions and motions of the planets and moons, usually according to the heliocentric model. It may also represent the relative sizes of these bodies; but since accurate scaling is often not practical due to the actual large ratio differences, a subdued approximation may be used instead. Though the Greeks had working planetaria, the first orrery that was a planetarium of the modern era was produced in 1704, and one was presented to Charles Boyle, 4th Earl of Orrery — whence came the name. They are typically driven by a clockwork mechanism with a globe representing the Sun at the centre, and with a planet at the end of each of the arms.
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