How are you astro lovers? Looks like you are searching information regarding NEBULA. You are at the right place. Today, we will be discussing about What is Nebula and types of nebula.
What is NEBULA ?
Nebula is a cloud of dust particles and gases in space. The world nebula is derived from the Latin word for clouds. Nebulae are among the most beautiful object in the universe. Stars are born in nebulae. The stars make them glow with rich colors.
A nebula is composed of about 90 per cent hydrogen, 10 per cent helium, and 0.1 per cent heavy elements. Nebulae are divided into emission nebulae, reflection nebulae, dark nebulae, planetary nebulae, and supernova remnants. Emission and reflection nebulae are also known as diffuse nebulae.
Types of Nebula
Following are the different types of nebula present in this cosmos:
An emission nebula is a nebula that glows emits reddish light. The reddish light is emitted when electrons and protons combine to form hydrogen. Emission nebulae are among the most beautiful objects in the sky.
The Orion nebula is the emission nebula. It is also known as ‘The Great Nebula in Orion’ and is easily visible to the naked eye as the middle star in Orion’s sword.
A dark nebula block all light from object behind it. Dark nebulae do not have a defined regular shape and are very similar to reflection nebulae in composition. They are usually seen together with emission and reflection nebulae.
Many dark nebulae in the Milky way are visible to the naked eye. The Horse head nebula in Orion is a example of a dark nebula.
When a supernova explodes, it blows a large amount of stellar matter out into space. Supernova remnant is the nebula formed from the remains of a supernova explosion. T
hey are extremely important for understanding our galaxy. They heat up the interstellar medium and distribute heavy elements throughout the galaxy and accelerate cosmic rays.
The Crab nebula is the remnant of a supernova that explodes in AD 1054. The nebula is located in the constellations Taurus and is around 6,500 light years away from Earth. It has a pulsar at its centre, which rotates 30 times per second.
The pulsar emits pulses of radiating ranging from gamma rays to radio waves. The nebula was first observed in 1731 by John Bevis.
Planetary nebulae are nebulae that look like planets because of their round shape. A planetary nebula surround a star. Planetary nebulae are formed by the gases released during the explosion of an extreme hot star.
There are around 1500 planetary nebulae in the milky way. The Ring Nebula (M57) in the constellation Lyra is a example of a planetary nebula.
The Ring Nebula is a planetary nebula. It is located in the constellations Lyra. It was discovered by Antoine Darquier de Pellepoix in 1779. It is also known as the Messier 57 or NGC 6720.
Stellar nurseries are nebulae where stars are formed. Several nebulae are considered stellar nurseries. The Eagle Nebula and the Orion Nebula are examples of stellar nurseries. The Eagle Nebula is a stellar nursery. It is around 7,000 light years away from our planet.
A reflection nebula that does not emit its own radiation. It reflects the light energy from a star or group of stars. Reflection nebulae are generally blue in color. They are composed of carbon compounds and compounds of other elements like nickel and iron.
There are around 500 known reflection nebulae. The Trifid Nebula (M20) in the constellation Sagittarius is an example of reflection nebula.