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Nebulae final anshul

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Anshul Yadav

on 9 June 2013

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Transcript of Nebulae final anshul


To infinity and beyond...... Introduction
A nebula is a cosmic cloud of dust or gas in space.
The word 'nebula' comes from the Latin word for 'cloud'.
Most nebulae are made with 90% hydrogen, 9% helium and 0.1% carbon/nitrogen/magnesium/potassium and other heavy elements.
Nebulae are made in regions where stars are being formed or they can be where the remainders of dead, old stars are. When were Nebulae discovered properly?
The first real interest of nebulae began in the 1700s when the first serious studies of the sky began by Charles Messier. Whilst he was on the search for comets, he often stumbled upon 'faint smudges of light' which were later named Nebulae. This is Orion Nebula or Messier 42 Types of Nebulae
There are five types of nebulae :
Emission nebula
Reflection nebula
Dark nebula
Planetary nebula
Supernova nebula Emission Nebula
Emission nebulae are clouds of hot gas. A star on the inside of these nebulae gives energy to the atoms within the cloud giving out ultraviolet radiation. When the atoms cool down, they give off radiation therefore making the nebula glow. It usually glows red but sometimes it glows green or blue.
The Orion Nebula is an emission nebula. Reflection Nebula
A Reflection nebula reflects light energy from nearby stars and does not emit any radiation of its own. They are often the site of star formations.
They are usually blue because of the way the light is scattered.
The Trifid Nebula is a good example of a Reflection Nebula. Dark Nebula
A Dark nebula is a dust cloud that prevents the light from getting behind it. They are similar to Reflection nebulae in composition and looks, except Dark nebulae tend to be darker colours like purple and dark blue.
The Horsehead nebula in Orion is a Dark nebula. Planetary Nebula
A Planetary Nebula is gas in a sort of shell produced by a dying star. The only reason they are called 'Planetary nebulae' is because of their round shape, they look a bit like planets. The outer parts of the nebula is illuminated by the star within.
The Ring Nebula is a Planetary Nebula. Supernova Remnant
Supernova Remnant is a cloud of glowing remains of a star after a supernova. Supernovas are when a star blows up thus ending its life and creating a massive explosion which blasts its remnants into space. The star's remains still contain energy which is why it glows. The Crab Nebula is a Supernova Remnant. These are some stunning pictures of nebulae. What is the nearest nebula to earth?
The nebula closest to earth is Sharpless or SH 2-216. It is also one of the oldest nebulae.
It is only 390 light years distant from earth. It is a Planetary Nebula. Interesting Facts About Nebulae
Some nebulae are only millions of miles across yet some are so big that they are hundreds of light years across
The Crab Nebula grows 1,500 km every second
In around 5 billion years, after its supernova, our Sun will become a planetary nebula
Some nebulae can be seen from earth with the naked eye Thank you for listening
Feel free to ask queries I HOPE YOU LEARNT SOMETHING FROM IT!
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