What are the seven main classes of stars?

There are seven main types of stars. In order of decreasing temperature, O, B, A, F, G, K, and M. This is known as the Morgan–Keenan (MK) system. The majority of all stars in our galaxy and even the Universe are main-sequence stars.

What are the different types of spectral classes?

Spectral Classes
Star TypeColorExamples
ABlueSirius, Vega
FBlue to WhiteCanopus, Procyon
GWhite to YellowSun, Capella
KOrange to RedArcturus, Aldebaran

How many spectral classes are there?

Each spectral type is divided into 10 subclasses, A0, A1, A2, … A9 etc. The spectral types and sub-classes represent a temperature sequence, from hotter (O stars) to cooler (M stars), and from hotter (subclass 0) to cooler (subclass 9). The temperature defines the star’s “color” and surface brightness.

What are the luminosity classes of stars?

Classification. Luminosity classes are labeled with Roman numerals from I to V: I are supergiant stars, II are bright giants, III are ordinary giants, IV are subgiants, and V are ordinary main sequence stars.

What type of star is the Betelgeuse?

Betelgeuse/Spectral type

What are the 3 main types of stars?

The Different Types of Stars
  • Protostar. A protostar is what comes before a star has formed – a collection of gas that collapsed from a huge molecular cloud. …
  • T Tauri Stars. …
  • Main Sequence Stars. …
  • Red Giant Stars. …
  • White Dwarf Stars. …
  • Red Dwarf Stars. …
  • Neutron Stars. …
  • Supergiant Stars.

What star is D?

Stars and star systems (D)
Star or star systemLocational references
Delta Pegasi (Alpha Andromedae)Andromeda constellation, visible from Sol (97 light-years)
Delta Sigma
Delta Triciatu
Deneb Kaitos

What spectral class is the sun in?

The Sun is a class G star; these are yellow, with surface temperatures of 5,000–6,000 K. Class K stars are yellow to orange, at about 3,500–5,000 K, and M stars are red, at about 3,000 K, with titanium oxide prominent in their spectra.

What are the 5 sizes of stars?

What Are the Different Sizes of Stars?
  • Super Giant Stars. The stars known a Super Giants are luminous stars with a mass more than 10 times higher than that of our sun and have started to decay. …
  • Giant Stars. …
  • Main Sequence White Dwarf Stars. …
  • Brown Dwarfs.

How do we classify stars?

Astronomers classify stars according to their physical characteristics. Characteristics used to classify stars include color, temperature, size, composition, and brightness. Stars vary in their chemical composition.

How do you determine the spectral type of a star?

In astronomy, stellar classification is the classification of stars based on their spectral characteristics. Electromagnetic radiation from the star is analyzed by splitting it with a prism or diffraction grating into a spectrum exhibiting the rainbow of colors interspersed with spectral lines.

What is the largest star in the universe?

UY Scuti
The largest known star in the universe is UY Scuti, a hypergiant with a radius around 1,700 times larger than the sun. And it’s not alone in dwarfing Earth’s dominant star.

How many galaxies are there?

Currently, in 2020, it was estimated that there are around 2 trillion galaxies in the observable Universe. Each galaxy is unique, ranging in size from 10,000 light-years to hundreds of light-years.

What object is between Uranus and Saturn?

2060 Chiron /ˈkaɪərɒn/ is a small Solar System body in the outer Solar System, orbiting the Sun between Saturn and Uranus. Discovered in 1977 by Charles Kowal, it was the first-identified member of a new class of objects now known as centaurs—bodies orbiting between the asteroid belt and the Kuiper belt.

What star color is the hottest?

Blue stars
White stars are hotter than red and yellow. Blue stars are the hottest stars of all.

What is the closest star to Earth?

The closest star to Earth is a triple-star system called Alpha Centauri. The two main stars are Alpha Centauri A and Alpha Centauri B, which form a binary pair. They are about 4.35 light-years from Earth, according to NASA.

Is there a green star?

There are no green stars because the ‘black-body spectrum’ of stars, which describes the amount of light at each wavelength and depends on temperature, doesn’t produce the same spectrum of colours as, for example, a rainbow.

What Colour is the sun?






Connecticut Sun/Colors
The color of the sun is white. The sun emits all colors of the rainbow more or less evenly and in physics, we call this combination “white”. That is why we can see so many different colors in the natural world under the illumination of sunlight.

What color is the moon?

Look up at the moon and you’ll probably see a yellowish or white disk, pockmarked by darker structures. But despite this first-glance appearance, the moon isn’t exactly yellow nor bright white. It’s more of a dark grey, mixed in with some white, black, and even a bit of orange — and all this is caused by its geology.

Is there a blue sun?

What if we had a blue sun? … Though the sun may appear yellow or reddish to the naked eye, it’s actually an ordinary white star. And the blue version released by NASA was made using a specific wavelength of ultraviolet light known as CaK, which is emitted by ionized calcium in the sun’s atmosphere.

Is there a purple sun?

Although you can spot many colors of stars in the night sky, purple and green stars aren’t seen because of the way humans perceive visible light. … And there are ordinary yellow ones like our sun that might be stable and warm enough to support life. The color of a star is linked to its surface temperature.

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 if Earth had two suns?

The Earth’s orbit could be stable if the planet rotated around the two stars. The stars would have to be close together, and the Earth’s orbit would be further away. … Most likely, beyond the habitable zone, where the heat of the suns wouldn’t be enough to keep our water in a liquid state.