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Transcript of NEBULAE
Which of these nebulae are not real???
What are nebulae made of???
What does (did) Nebulae mean???
In the olden days, nebula meant almost any weird, new object in space.
Etymological root of nebula is cloud.
Nowadays, we sometimes use the word “nebula” to refer to galaxies, various types of star clusters and various kinds of interstellar dust/gas clouds.
The word “nebula” should be reserved for gas and dust clouds and not for groups of stars.
This is a cool YouTube video
Nebulae are made of hydrogen, helium, dust, and other ionized gases.
Different types of Nebulae
Dark Nebulae (Adam's favorite)
Supernova Remnant (Jacob's Favorite)
Planetary nebulae are shells of gas thrown out by some stars near the end of their lives. Our Sun will probably make a planetary nebula in about 5 billion years. They have nothing at all to do with planets; the terminology was invented because they often look a little like planets in small telescopes. A typical planetary nebula is less than one light-year across.
Dark nebulae are clouds of dust which are simply blocking the light from whatever is behind. They are physically very similar to reflection nebulae; they look different only because of the geometry of the light source, the cloud and the Earth. Dark nebulae are also often seen in conjunction with reflection and emission nebulae. A typical diffuse nebula is a few hundred light-years across.
Dark nebulae are clouds of dust which are simply blocking the light from whatever is behind.
They are physically very similar to reflection nebulae; they look different only because of the geometry of the light source, the cloud and the Earth. Dark nebulae are also often seen in conjunction with reflection and emission nebulae. A typical dark nebula is a few hundred light-years across!
Reflection nebulae are clouds of dust which are simply reflecting the light of a nearby star or stars. Reflection nebulae are also usually sites of star formation. They are usually blue because the scattering is more efficient for blue light. Reflection nebulae and emission nebulae are often seen together and are sometimes both referred to as diffuse nebulae.
Supernova remnants are created when a star ends its life in a massive explosion known as a supernova.
The explosion blows a large amount of the star's matter out into space. This cloud of matter glows with the remains of the star that created it. One of the best examples of a supernova remnant is the crab Nebula (M1) in Taurus. It is illuminated by a pulsar which was created by the supernova.
What are nebulae made of???
What is a star called when it ends it's life???
A Dead Star
An Atomic Bomb
Emission nebulae are clouds of high temperature gas.
The atoms in the cloud are energized by ultraviolet light from a nearby star and emit radiation as they fall back into lower energy states (in much the same way as a neon light).
These nebulae are usually red because the predominant emission line of hydrogen happens to be red (other colors are produced by other atoms, but hydrogen is by far the most abundant).
Emission nebulae are usually the sites of recent and ongoing star formation.