- Can we see galaxies?
- Is Orion in our galaxy?
- How long does it take for stars to form?
- How is a reflection nebula created?
- At what point does a protostar become a star?
- What is a dying star called?
- What is inside a planetary nebula?
- What is the easiest nebula to see?
- How are nebula formed?
- Is Earth in a nebula?
- What nebula can we see?
- Why do stars twinkle?
- What is a dead star called?
- What causes a dark nebula?
- How long does a star live for?
- What is it like inside a nebula?
- Why is the nebula dark?
Can we see galaxies?
Yes, you can see a few other galaxies without using a telescope.
The nearby Andromeda Galaxy, also called M31, is bright enough to be seen by the naked eye on dark, moonless nights.
The Andromeda Galaxy is the only other (besides the Milky Way) spiral galaxy we can see with the naked eye..
Is Orion in our galaxy?
The Orion Arm, or Orion–Cygnus Arm, is a minor spiral arm of the Milky Way galaxy. It is of interest because the Solar System (including the Earth) is inside it. … The Solar system is on the Orion spur, between the two longer adjacent arms Perseus and Carina-Sagittarius.
How long does it take for stars to form?
Then, almost every ion in the gas would need to find an electron to neutralize it before the gas could decouple from the magnetic field and collapse. This would suggest that it takes more than 10 million years to form a star.
How is a reflection nebula created?
A reflection nebula is created when light from a star is scattered or reflected off a neighbouring dust cloud. The scattered light is slightly polarised and has a spectrum similar to that of the illuminating star, only bluer.
At what point does a protostar become a star?
A protostar becomes a main sequence star when its core temperature exceeds 10 million K. This is the temperature needed for hydrogen fusion to operate efficiently. The length of time all of this takes depends on the mass of the star. The more massive the star, the faster everything happens.
What is a dying star called?
Some types of stars expire with titanic explosions, called supernovae. When a star like the Sun dies, it casts its outer layers into space, leaving its hot, dense core to cool over the eons.
What is inside a planetary nebula?
A planetary nebula, abbreviated as PN or plural PNe, is a type of emission nebula consisting of an expanding, glowing shell of ionized gas ejected from red giant stars late in their lives. … All planetary nebulae form at the end of the life of a star of intermediate mass, about 1-8 solar masses.
What is the easiest nebula to see?
The Orion nebula is the quickest and easiest one to locate in the sky. It is as far as almost 1300 light-years from our planet. It is called so because it is located in the Orion constellation. The Orion Nebula is also known as Messier 42, NGC 1976 or M42.
How are nebula formed?
The Short Answer: A nebula is a giant cloud of dust and gas in space. Some nebulae (more than one nebula) come from the gas and dust thrown out by the explosion of a dying star, such as a supernova. Other nebulae are regions where new stars are beginning to form.
Is Earth in a nebula?
The planet Earth is not part of any particularly named Nebula . Earth is part of the Solar System which is part of our home galaxy, the so-called “Milky Way”, which is part of the so-called Local Group , a collection of more than 50 other galaxies in the “neighborhood” of our own galaxy.
What nebula can we see?
Orion NebulaThe Orion Nebula (also known as Messier 42, M42, or NGC 1976) is a diffuse nebula situated in the Milky Way, being south of Orion’s Belt in the constellation of Orion. It is one of the brightest nebulae, and is visible to the naked eye in the night sky.
Why do stars twinkle?
As light from a star races through our atmosphere, it bounces and bumps through the different layers, bending the light before you see it. Since the hot and cold layers of air keep moving, the bending of the light changes too, which causes the star’s appearance to wobble or twinkle.
What is a dead star called?
A black dwarf is a theoretical stellar remnant, specifically a white dwarf that has cooled sufficiently that it no longer emits significant heat or light.
What causes a dark nebula?
The extinction of the light is caused by interstellar dust grains located in the coldest, densest parts of larger molecular clouds. … Dark clouds appear so because of sub-micrometre-sized dust particles, coated with frozen carbon monoxide and nitrogen, which effectively block the passage of light at visible wavelengths.
How long does a star live for?
about 10 billion yearsThe life of a star is determined by how large it is. Stars live different lengths of time, depending on how big they are. A star like our sun lives for about 10 billion years, while a star which weighs 20 times as much lives only 10 million years, about a thousandth as long.
What is it like inside a nebula?
Nebulae are pretty only when they are hundreds of light-years away. They look thick and cloudy only because you see the structures of light-years in thickness. Once you’re close to them, their light spreads out so much that you can’t see them. You could fly your spaceship right into the nebula and never even know it.
Why is the nebula dark?
Dark Nebula. Dark nebulae are interstellar clouds that contain a very high concentration of dust. This allows them to scatter and absorb all incident optical light, making them completely opaque at visible wavelengths.