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Autoguiding - Thrush Observatory
Autoguiding - Thrush Observatory

... no more difficult or complicated than using an off-axis guider if one follows a few simple rules. • The most fundamental mistake is to attempt to mount the guide scope directly to the primary tube. A guide scope is just too heavy and will bend the main tube in all sorts of random ways when in use. • ...
Visual Measurements of the Multiple Star
Visual Measurements of the Multiple Star

... tronomic eyepiece is being used without a Barlow lens 8.1 with a position angle of 210 degrees and a separaand cannot effectively measure dim stars or ones with tion of 0.3 arc seconds (Mason 2009). This separation small separations. The choice of neglected double was just within the Dawes limit for ...
Astro Physics Notes and Study Guide 2015-17
Astro Physics Notes and Study Guide 2015-17

... because the product is less massive than its constituents. You have the skills to calculate this energy release, which turns out to be ...
Compa ring between Spectroscopic and Photometric Method for
Compa ring between Spectroscopic and Photometric Method for

... In the dark night sky, we see many stars and it looks like some stars are very close together. Proximity of two stars is apparent in some cases due to the effect of projection of stars according to an observer. Nevertheless, we also see stars that are gravitationally bound and their proximity on the ...
Refusing to Go Quietly: GRBs and Their Progenitors
Refusing to Go Quietly: GRBs and Their Progenitors

Stellar Continua
Stellar Continua

Main-Sequence Stars and the Sun
Main-Sequence Stars and the Sun

Starbursts – from 30 Doradus to Lyman
Starbursts – from 30 Doradus to Lyman

Star formation and internal kinematics of irregular galaxies
Star formation and internal kinematics of irregular galaxies

The Sun and Stars
The Sun and Stars

... born? (mostly hydrogen) and dust called a nebula (Latin for “mist”). Gravitational forces cause denser regions of the nebula to collapse, forming a protostar. A protostar is the earliest stage in the life cycle of a star. The gases at the center of the protostar continue to collapse, causing pressur ...
Star Formation in Our Galaxy - Wiley-VCH
Star Formation in Our Galaxy - Wiley-VCH

Solutions to the 1 st Astronomy Exam
Solutions to the 1 st Astronomy Exam

... degree of further rotation aligns the arrow and Sun and you have one solar day (24 hours) since the last time the Sun was on the meridian. The geometry of the situation also shows that the Earth moves about 1 degree in its orbit during one sidereal day. That night the Earth observer will see certain ...
A dust ring around Epsilon Eridani: analogue to the young Solar
A dust ring around Epsilon Eridani: analogue to the young Solar

Modified True/False - Indicate whether the statement is true or false
Modified True/False - Indicate whether the statement is true or false

... HS-ESS1-1 When hydrogen nuclei fuse, they produce helium. HS-ESS1-1 A cloud of dust and gas in which a star forms is called a nebula. HS-ESS1-1 As white dwarfs cool, they often explode as supernovas. HS-ESS1-1 Combining of lightweight nuclei into heavier nuclei, such as four hydrogen nuclei combinin ...
D ASTROPHYSICS
D ASTROPHYSICS

The Life of the Sun
The Life of the Sun

Here
Here

Evolution and nucleosynthesis of extremely metal
Evolution and nucleosynthesis of extremely metal

Self-avoiding Random Walks and Olbers` Paradox - Serval
Self-avoiding Random Walks and Olbers` Paradox - Serval

IYA 2009 - AAVSO Beginner/Intermediate Amateur Astronomer
IYA 2009 - AAVSO Beginner/Intermediate Amateur Astronomer

Why Spectroscopy?
Why Spectroscopy?

AST1100 Lecture Notes
AST1100 Lecture Notes

Document
Document

... • C is incorrect because Barnard’s Star has the biggest apparent magnitude in the chart, so it is the dimmest object listed. • D is incorrect because Alpha Centauri has a bigger apparent magnitude than the full moon and Venus, so it is dimmer. ...
Poster
Poster

The Evening Sky Map
The Evening Sky Map

< 1 ... 13 14 15 16 17 18 19 20 21 ... 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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