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Page pour l`impression
Page pour l`impression

... There is a resonance of order n/m, where n and m are two integers, if a planet makes n revolutions when the other one makes m revolutions. In Neptune's rings, the edge of the Adams ring is in a resonance 42:43 with the satellite Galatea. Resonances between the rotation motion of a body and its revol ...
Complete the “Assess Your Understanding” including
Complete the “Assess Your Understanding” including

... and becomes a _____________________. A white dwarf is about the size of Earth but a million times more dense than the sun. It ________________________ from leftover energy. After billions of years, the leftover energy is gone; the white dwarf _________________________________________________________ ...
Lecture 9a: More on Star formation and evolution 10/22
Lecture 9a: More on Star formation and evolution 10/22

OVERVIEW: Stars and space
OVERVIEW: Stars and space

... • to explain how stars are able to maintain their energy output for millions of years • to explain why the early Universe contained only hydrogen but now contains a large variety of different elements. Skills, knowledge and understanding of how science works set in the context of: • Our Sun is one o ...
The Milky Way - Houston Community College System
The Milky Way - Houston Community College System

Ch 28 Outline
Ch 28 Outline

White Dwarfs
White Dwarfs

White Dwarfs
White Dwarfs

Chapter 07
Chapter 07

... nature of the heavens, but the clues are meaningless unless astronomers understand how atoms leave their traces on starlight. Thus, we dedicate an entire chapter to understanding how atoms interact with light. This chapter marks a transition in the way we look at nature. Earlier chapters described w ...
MSci Astrophysics 210PHY412
MSci Astrophysics 210PHY412

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ppt

... How can we test theories of star evolution? • Binaries help, because one can get mass so that theories can be tested • But stars change so slowly, it is impossible to test theories by watching just one star move through phases • Fortunately, there are 1011 stars in our Galaxy, all with a range of ma ...
Stars
Stars

... • Fusion causes pressure to increase. This pressure balances the attraction due to gravity and the star becomes a main sequence star. • When hydrogen in the core is depleted, a balance no longer exists between pressure and gravity. • The core contracts causing the core temp. to increase and the oute ...
28. What causes waves - Summer Science Safari
28. What causes waves - Summer Science Safari

... light year distance light travels in one year apparent magnitude how bright a star appears from earth galaxy largest grouping of stars in space absolute magnitude the actual brightness of a star parallax one of the ways we measure distances in space; apparent shift in a star’s location nebulae cloud ...
The life cycle of the Sun – HR Diagram
The life cycle of the Sun – HR Diagram

Star A
Star A

starevolution - Global Change Program
starevolution - Global Change Program

... example of a supernova remnant is the Cygnus Loop, lying about 2,500 light years away (on right). The evolution of even more massive stars produce other objects in our universe. Perhaps the most intriguing object that can form from a massive collapsing star is a black hole. These object are invisibl ...
File
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... *Elements release photons of unique wavelengths The bright lines show the wavelength of photons that are emitted from a gas cloud. Remember, each color has a specific wavelength. ...
3.6 spectral classes
3.6 spectral classes

... • Absorption spectra are used to classify stars into nine principal types, called spectral classes. • Hydrogen lines are much stronger in the spectra of some stars than in the Sun’s spectrum. • Astronomers once mistakenly thought that these stars had more hydrogen than other stars. • They classified ...
(Diurnal) Motion of the Sky A star`s daily path is its diurnal circle
(Diurnal) Motion of the Sky A star`s daily path is its diurnal circle

Stars Study Guide KEY
Stars Study Guide KEY

Stellar Evolution
Stellar Evolution

Significance of the 27 August 2016 Venus Jupiter Conjunction A
Significance of the 27 August 2016 Venus Jupiter Conjunction A

Measuring the Stars
Measuring the Stars

Chapter three: The properties of Stars
Chapter three: The properties of Stars

Lecture 16
Lecture 16

< 1 ... 59 60 61 62 63 64 65 66 67 ... 167 >

Dyson sphere

A Dyson sphere is a hypothetical megastructure that completely encompasses a star and hence captures most or all of its power output. It was first described by Olaf Stapledon in his science fiction novel, ""Star Maker"". The concept was later popularly adopted by Freeman Dyson. Dyson speculated that such structures would be the logical consequence of the long-term survival and escalating energy needs of a technological civilization, and proposed that searching for evidence of the existence of such structures might lead to the detection of advanced intelligent extraterrestrial life. Different types of Dyson spheres correlate with information on the Kardashev scale.Since then, other variant designs involving building an artificial structure or series of structures to encompass a star have been proposed in exploratory engineering or described in science fiction under the name ""Dyson sphere"". These later proposals have not been limited to solar-power stations. Many involve habitation or industrial elements. Most fictional depictions describe a solid shell of matter enclosing a star, which is considered the least plausible variant of the idea (see below). In May 2013, at the Starship Century Symposium in San Diego, Dyson repeated his comments that he wished the concept had not been named after him.
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