Send the link below via email or IMCopy
Present to your audienceStart remote presentation
- Invited audience members will follow you as you navigate and present
- People invited to a presentation do not need a Prezi account
- This link expires 10 minutes after you close the presentation
- A maximum of 30 users can follow your presentation
- Learn more about this feature in our knowledge base article
Do you really want to delete this prezi?
Neither you, nor the coeditors you shared it with will be able to recover it again.
Make your likes visible on Facebook?
You can change this under Settings & Account at any time.
Transcript of Untitled Prezi
They burn out when their cores become too dense to sustain internal reactions, and collapse into supernovas or black holes. The idea of "apparent magnitude" goes all the way back to the Greek astronomer Hipparchus. Basically, he looked at the stars in the sky and classified them by how bright they appear -- the brightest stars were "magnitude 1", the next brightest were "magnitude 2", etc., down to "magnitude 6", which were the faintest stars he could see. It is this basic classification from over 2,000 years ago that led to the magnitude scale we have now! Absolute magnitude (also known as absolute visual magnitude when measured in the standard V photometric band) is the measure of a celestial object's intrinsic brightness. It is the apparent magnitude an object would have if it were at a standard luminosity distance (10 parsecs, or 32.6 light years) away from the observer, in the absence of astronomical extinction. It allows the true brightnesses of objects to be compared without regard to distance. Bolometric magnitude is luminosity expressed in magnitude units; it takes into account energy radiated at all wavelengths, whether observed or not. absolute magnitude how stars die out apparent magnitude Electromagnetic spectrum What do you see when you look up into the night sky? If you live well away from major light pollution sources you can perhaps see several hundred stars on a good night. There may even be enough stars visible for you to connect the stars with imaginary lines to form patterns in the sky. Though you can make up your own star patterns, sort of like a Rorschach ink-blot test, today s star patterns are quite old. One of these constellations, Cygnus the Swan (also known as the Northern Cross), can be found in one of the richest star regions in the sky. how to see cygnus Deneb Vega Altair Gienah Tarazed other stars in Cygnus Deneb star closest to earth in the cygnus constellation 3200 lightyears distance from earth Gienah farthest from earth 72 light years 57 stars have planets Another story says the swan is Orpheus, who was murdered by the Thracian women while under the influence of Bacchus. Upon his death, the celebrated musician was placed in the heavens to spend eternity by his harp, Lyra. Yet another variant says that the swan represents the form taken by Jupiter when he deceived Leda and fathered Pollux. mythology of cygnus neighboring stars Shooting star is a common name for the visible path of a meteoroid as it enters the atmosphere, becoming a meteor. As it enters the atmosphere the meteor burns and vaporizes. If the meteor survives the entry and lands on the surface of the Earth, it is classified as a meteorite. shooting star explanation Where do they come from? They probably come from within our own solar system, rather than interstellar space. Their composition provides clues to their origins. They may share a common origin with the asteroids. Some meteoritic material is similar to the Earth and Moon and some is quite different. Some evidence indicates an origin from comets. shooting stars; where they come from meteor showers usually occur annually and with varying intensity. how often they occur The Night Sky: Geminid Meteor Shower-Cygnus meteor showers in Cygnus http://www.bbc.co.uk/news/world-europe-21470205 video Stars twinkle because of turbulence in the atmosphere of the Earth. As the atmosphere churns, the light from the star is refracted in different directions. This causes the star's image to change slightly in brightness and position, hence "twinkle." This is one of the reasons the Hubble telescope is so successful: in space, there is no atmosphere to make the stars twinkle, allowing a much better image to be obtained. what makes stars twinkle yellowish-white color of twinkle releases very small amounts of sulfur dioxide and nitrogen oxides, virtually no ash or particulate matter, and lower levels of carbon dioxide, carbon monoxide, and other reactive hydrocarbons. gasses