NEBULA A  nebula  is an  interstellar cloud  of  dust ,  hydrogen  gas and  plasma . It is the first stage of a  star 's c...
BOOMERANG NEBULA Originally  nebula  was a general name for any extended  astronomical   object , including  galaxies  bey...
Nebulae often develop star-forming regions, such as in the  Eagle Nebula . This nebula is depicted in one of  NASA 's most...
BUBBLE NEBULA
Many nebula form from the  gravitational  collapse of diffuse gas in the  interstellar medium  or ISM. As the material col...
The size of these nebulae, known as HII regions, varies depending on the size of the original cloud of gas, and the number...
CASSIOPEIAA NEBULA
Some nebulae are formed as the result of  supernova  explosions, the death throes of massive, short-lived stars. The mater...
Other nebulae may form as  planetary nebulae . This is the final stage of a low-mass star's life, like  Earth 's  Sun .  S...
A  planetary nebula  is an  astronomical   object  consisting of a glowing shell of  gas  and  plasma  formed by certain t...
Most nebulae can be described as  diffuse nebulae , which means that they are extended and contain no well-defined boundar...
Emission nebulae contain  ionized  gas (mostly ionized  hydrogen ) that produces  spectral line  emission. These emission ...
Dark nebulae are similar to diffuse nebulae, but they are not seen by their emitted or reflected light. Instead, they are ...
Planetary nebulae are so called because the first  astronomers  who observed these objects thought that the nebulae resemb...
A  protoplanetary  nebula  (PPN) is an astronomical object which is at the short-lived episode during a star's rapid  stel...
A  supernova  occurs when a high-mass star reaches the end of its life. When  nuclear fusion  ceases in the core of the st...
Now let’s sit back and gaze upon a variety of nebulae … CHRISTMAS TREE NEBULA CONE NEBULA
CRESCENT NEBULA EGG NEBULA
ESKIMO NEBULA HELIX NEBULA
INTERSTELLAR CLUSTER 1396 I C 2924
LAGOON NEBULA MESSIER 20 M Z 3
M 29 NEAR GALAXY CLUSTER 346
 
 
 
 
 
 
 
 
Silver Surfer wanders the cosmos in search of nebula
Galactus Travels the spaceways feeding upon planets and enjoys the occasional nebula desert.
These two don’t often get along.
But that's another PowerPoint May the Nebulizer be with YOU! Until next time…
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Naturalists at Large - Nebula

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Naturalists at Large - Nebula

  1. 1. NEBULA A nebula is an interstellar cloud of dust , hydrogen gas and plasma . It is the first stage of a star 's cycle.
  2. 2. BOOMERANG NEBULA Originally nebula was a general name for any extended astronomical object , including galaxies beyond the Milky Way (some examples of the older usage survive; for example, the Andromeda Galaxy was referred to as the Andromeda Nebula before galaxies were discovered by Edwin Hubble ).
  3. 3. Nebulae often develop star-forming regions, such as in the Eagle Nebula . This nebula is depicted in one of NASA 's most famous images, the " Pillars of Creation ". In these regions the formations of gas, dust and other materials 'clump' together to form larger masses, which attract further matter, and eventually will become big enough to form stars. The remaining materials are then believed to form planets , and other planetary system objects.
  4. 4. BUBBLE NEBULA
  5. 5. Many nebula form from the gravitational collapse of diffuse gas in the interstellar medium or ISM. As the material collapses under its own weight, massive stars may form in the center, and their ultraviolet radiation ionises the surrounding gas, making it visible at optical wavelengths . An example of this type of nebula is the Rosette Nebula .
  6. 6. The size of these nebulae, known as HII regions, varies depending on the size of the original cloud of gas, and the number of stars formed can vary too. As the sites of star formation, the formed stars are sometimes known as a young, loose cluster . PELICAN NEBULA
  7. 7. CASSIOPEIAA NEBULA
  8. 8. Some nebulae are formed as the result of supernova explosions, the death throes of massive, short-lived stars. The material thrown off from the supernova explosion is ionised by the supernova remnant. One of the best examples of this is the Crab Nebula , in Taurus . It is the result of a recorded supernova in the year 1054 and at the centre of the nebula is a neutron star , created during the explosion.
  9. 9. Other nebulae may form as planetary nebulae . This is the final stage of a low-mass star's life, like Earth 's Sun . Stars with a mass up to 8-10 solar masses evolve into red giants and slowly lose their outer layers during pulsations in their atmospheres. When a star has lost a sufficient amount of material, its temperature increases and the ultraviolet radiation it emits is capable of ionizing the surrounding nebula that it has thrown off.
  10. 10. A planetary nebula is an astronomical object consisting of a glowing shell of gas and plasma formed by certain types of stars at the end of their lives. The name originates from a similarity in appearance to giant planets when viewed through a small optical telescope and is unrelated to planets of the solar system. They are a relatively short-lived phenomenon, lasting a few tens of thousands of years, compared to a typical stellar lifetime of several billion years. CATS EYE NEBULA
  11. 11. Most nebulae can be described as diffuse nebulae , which means that they are extended and contain no well-defined boundaries. In visible light these nebulae may be divided into emission nebulae and reflection nebulae , a categorization that depends on how the light we see is created. EMISSIONNEBULA REFLECTION NEBULA
  12. 12. Emission nebulae contain ionized gas (mostly ionized hydrogen ) that produces spectral line emission. These emission nebulae are often called HII regions ; the term "HII" is used in professional astronomy to refer to ionized hydrogen. In contrast to emission nebulae, reflection nebulae do not produce significant amounts of visible light by themselves but instead reflect light from nearby stars. The Flame Nebula is part of the Orion Molecular Cloud Complex and is an emission nebula.
  13. 13. Dark nebulae are similar to diffuse nebulae, but they are not seen by their emitted or reflected light. Instead, they are seen as dark clouds in front of more distant stars or in front of emission nebulae. HORSEHEAD NEBULA
  14. 14. Planetary nebulae are so called because the first astronomers who observed these objects thought that the nebulae resembled the disks of planets, although they are not at all related to planets.
  15. 15. A protoplanetary nebula (PPN) is an astronomical object which is at the short-lived episode during a star's rapid stellar evolution .
  16. 16. A supernova occurs when a high-mass star reaches the end of its life. When nuclear fusion ceases in the core of the star, the star collapses inward on itself. The gas falling inward either rebounds or gets so strongly heated that it expands outwards from the core, thus causing the star to explode. CRAB NEBULA
  17. 17. Now let’s sit back and gaze upon a variety of nebulae … CHRISTMAS TREE NEBULA CONE NEBULA
  18. 18. CRESCENT NEBULA EGG NEBULA
  19. 19. ESKIMO NEBULA HELIX NEBULA
  20. 20. INTERSTELLAR CLUSTER 1396 I C 2924
  21. 21. LAGOON NEBULA MESSIER 20 M Z 3
  22. 22. M 29 NEAR GALAXY CLUSTER 346
  23. 31. Silver Surfer wanders the cosmos in search of nebula
  24. 32. Galactus Travels the spaceways feeding upon planets and enjoys the occasional nebula desert.
  25. 33. These two don’t often get along.
  26. 34. But that's another PowerPoint May the Nebulizer be with YOU! Until next time…

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