NASA Pictures

Fernando Del Valle García 1ºB

2012 October 23

Mammatus Clouds Over Saskatchewan

• Normal cloud bottoms are flat. This is because moist warm air that rises and cools will condense into water droplets at a specific temperature, which usually corresponds to a very specific height.

• As water droplets grow, an opaque cloud forms. Under some conditions, however, cloud pockets can develop that contain large droplets of water or ice that fall into clear air as they evaporate.

2012 October 24

NGC 206 and the Star Clouds of Andromeda

In the photograph we can see the NGC 206 that is a big association of stars situated in the southwest of Andromeda’s Disk.

It has a lot of young stars that are less than 10 million years old.

The association of stars is large, it expands through 4000 light years.

2012 October 25

The Medusa Nebula

Braided, serpentine filaments of glowing gas suggest this nebula's popular name, The Medusa Nebula. Also known as Abell 21, this Medusa is an old planetary nebula some 1,500 light-years away in the constellation Gemini. Like its mythological namesake, the

nebula is associated with a dramatic transformation.The planetary nebula phase represents a final stage in the evolution of low mass stars

like the sun, as they transform themselves from red giants to hot white dwarf stars and in the process shrug off their outer layers.

2012 October 26

Reflection Nebula vdB1

Every book has a first page and every catalog a first entry. And so this lovely blue cosmic cloud begins the van den Bergh Catalog (vdB) of stars

surrounded by reflection nebulae. Interstellar dust clouds reflecting the light of the

nearby stars, the nebulae usually appear blue because scattering by the dust grains is more

effective at shorter (bluer) wavelengths. The same type of scattering gives planet Earth

its blue daytime skies.

2012 October 27

A Halo for NGC 6164

Beautiful emission nebula NGC 6164 was created by a rare, hot, luminous O-type star, some 40 times as massive as the

Sun.

Seen at the center of the cosmic cloud, the star is a mere 3 to 4 million years old. In another three to four million years the

massive star will end its life in a supernova explosion.Spanning around 4 light-years, the nebula itself has a bipolar

symmetry.

By : Fernando Del Valle García 1º BTO BLast Supernova in the Milky Way

Galaxy