In the last post I talked about Black Holes, so today I wanted to talk about what can form when a Supernova appears: a nebulae.
How do Nebulae form?
Well… Nebulae are formed when the gases and particles from old exploded stars that collapse forming a cloud with its own gravitational form. In 5 billion years our Sun will become a nebulae too, when it will blow its outer layers while being a Red Giant.
The true size of Nebulae.
How big do you think that a nebula can get? 1 light year? 10 light years? Actually, nebulae can stretch over hundreds of light years across. Let’s do a quick calculation: If a nebula would stretch 200 light years across it would stretch for exactly 1,892,146,094,516,160 Kilometers (1175725074636721.5 Miles). Yeah, that’s pretty big…
How do stars form inside a nebula?
As I told you above, a nebula consists of particles and gases from other stars. Turbulence within Nebulae can give birth to knots that have enough gravitational to collapse under their own weight, thus generating heat in the center of the knot. The formation is now known as a protostar. When the cloud collapses the hot core of the star begins to gathering dust and gas. The remaining particles become planets, asteroids, and comets, or can remain as dust. The life span of the star depends on its mass. The heavier a star is, the less it will live.
Types of Nebulae:
There are several types of Nebulae: Emission Nebulae, Reflection Nebulae, Planetary Nebulae, The Supernova Remnant and the Dark Nebulae.
Facts about Nebulae:
• Did you know that until the 1920’s scientists used to classify distant galaxies as nebulae?Before that, it was thought that the Milky Way was the only galaxy in the Universe.
• Extra-Galactic Nebulae are nebulae that are outside of the Milky Way.
• The Nebulae closest to Earth is the Orion Nebula, situated at 1300 light years away from us.
• Some nebulae are named after their shape. The Hourglass Nebulae, for example, is located at 8.000 light years from Earth and looks like a hourglass.
• One of the most known nebulae is the Helix Nebula, which is often referred as “Eye of God” because of its eye shape: