galactic cloud

Deep Magellanic Clouds Image Indicates Collisions : Did the two most famous satellite galaxies of our Milky Way Galaxy once collide? No one knows for sure, but a detailed inspection of deep images like that featured here give an indication that they have. Pictured, the Large Magellanic Cloud is on the bottom right. The surrounding field is monochrome color-inverted to highlight faint filaments, shown in gray. Perhaps surprisingly, the featured research-grade image was compiled with small telescopes to cover the large angular field nearly 40 degrees across. Much of the faint nebulosity is Galactic Cirrus clouds of thin dust in our own Galaxy, but a faint stream of stars does appear to be extending from the SMC toward the LMC. Also, stars surrounding the LMC appear asymmetrically distributed, indicating in simulations that they could well have been pulled off gravitationally in one or more collisions. Both the LMC and the SMC are visible to the unaided eye in southern skies. Future telescopic observations and computer simulations are sure to continue in a continuing effort to better understand the history of our Milky Way and its surroundings. via NASA

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SOME AMAZING FACTS ABOUT NEBULAS!!!!  <3    <3    <3    <3   <3  

 
-Nebulas are interstellar clouds, composed by massive accumulations of gas (Hydrogen, helium and other ionized gases)  and dust.

-Most nebulae are of vast size, EVEN HUNDREDS OF LIGHT YEARS OF DIAMETER!!!

-Even though nebulas are gigantic galactic clouds, they have very low density . A nebular cloud the size of the earth would have a total mass of only a few kilograms , this is due to its gaseous nature.

-Nebulas are the birth places of stars and planets! 

With a little bit of time (millions of years he he he) gas , dust and other materials clump together to form larger masses until  it becomes massive enough to form stars. The remaining materials are believed to form planets and other planetary system stuff!!!

For more interesting facts and fun stuff follow musicat9419

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Ask Ethan: are we due for a mass extinction?

“The interactions with Neptune or other objects in the Kuiper belt/Oort cloud are random and independent of anything else going on in our galaxy, but it’s possible that passing through a star-rich region — such as the galactic disk or one of our spiral arms — could enhance the odds of a comet storm, and the chance of a comet strike on Earth. The recent American Scientist paper that David asks about claims that there’s a roughly 26-30 million year “periodic” pattern in the extinctions on Earth, which correlates roughly with the 28-32 million year period of when the Solar System passes through the Milky Way’s galactic plane! Coincidence, or could this be the cause of the extinctions?”

Looking at the history of life on Earth, the fossil record shows something incontrovertible: in order for new forms of life to rise to dominance, it requires something to knock the prior forms from dominating their ecological niche. This can come about in any number of ways, but the most striking changes come from catastrophic events that wipe a large percentage of species off the Earth at once: a mass extinction event. While the asteroid strike that wiped out the dinosaurs was perhaps the most famous one, there is bountiful evidence that there were many others over the past 500 million years, with perhaps some periodicity to these events. Recently, reports have emerged that our Sun’s passage through the galactic plane, with periods of 26-30 million years, might correlate with these events. Yet a look at the fossil record shows extinction events do not have the required periodicity to account for that, nor do Oort cloud strikes account for the majority of such events on Earth.