Whenyou glance into the sky at night, you see stars Stars are shinyspheres that contain hot gases. They are made up hydrogen, helium andother elements that are in fewer quantities. There are uncountablestars, those that we can see with our naked eyes and those that canonly be seen using a telescope. Those that we can see without the useof any technology refer the Milky Way galaxy. Different stars belongto different galaxies.
Starsvary in brightness from one to the other. There are those which arevery bright as compared to others. Just as there are different typesof starts known, the same case they have varying intensity of theirbrightness. Illumination of stars varies with the composition ofelements inside the star, the light energy emitted by the star andthe distance from the earth. The human eye is not very reliable inmeasuring the brightness of stars thereby the use of technology comesin handy in differentiating the amount of brightness of differentstars. There are those stars that are closest to the earth, such asthe sun. It’s the one that is most visible to the human eye andit’s the one that’s mostly experienced on earth due to theemission of heat energy. On the other hand, there are those starsthat are the brightest. People tend to think that the sun is thebrightest star because it appears big in diameter and bright ascompared to the others. The sun is responsible for light during theday and when it disappears in the evening, darkness falls and themoon and the far away stars brighten the night the best way they can.They vary in their amount of brightness as I shall discuss in thisessay from the brightest respectively.
Thebrightest star in the sky is referred to as Sirius (Schaaf,2008).It’s also known as the Dog Star and it belongs to the Canis Majorconstellation. It’s termed as the brightest due to its luminosityand distance from the earth. It’s the closest star to the earthafter the sun. It can easily be observed during the spring and thewinter seasons. In a span of time, it has been noticed that theSirius star is moving closer to the solar system, this means thatthere will be an increase in brightness. But after that, itsbrightness will reduce though it will remain the brightest star forthe longest time.
Canopusis the second brightest star in the night sky. It’s the brighteststar in its constellation. When observed with the naked eye, it’swhite in color. Its location is in the southern sky and when in thesouthern hemisphere, together with Sirius, they are observed and theonly time difference in their brightness to reach the earth isapproximately 21 minutes (Schaaf,2008).In a number of years, the Canopus star will increase its brightnessby being closer than the Sirius and thus become the brightest star inthe sky.
Thethird brightest star is known as Rigel Kentaurus. It’s in thetriple star system. Its double stars are dwarfs that surround andspin around it in a given number of years. These stars are put at thesame distance as the sun and the Uranus in the solar system. The twodwarf stars of the Rigel kentaurus star are the Alpha Centauri A andthe Alpha Centauri B (Schaaf,2008).There is a planet that was discovered in the Year 2012 that orbitsthe Alpha Centauri B. It is too close to its stars that it’simpossible to support life in it.
Arcturusis the fourth brightest star in the night sky. When observed, itlooks orange in color. It is popular for its large or sidewaysmotion. It is considered to be one of the oldest stars, older thanthe sun. It has been said that it has consumed almost all of itshydrogen and it’s in the phase of burning its hydrogen shell. It’sput across that when the sun evolves to be a red giant, it will looklike the Arcturus. It’s bigger and also it radiates more lightenergy as compared to the sun (Schaaf,2008).
Thefifth brightest star is the Vega Star which is also known as the Harpstar. It’s the brightest star in its constellation Lyra the Harp.It’s blue-whitish in color. Its noticeable blue color indicates itsemission of high temperatures, making it hotter than the sun. Whenobserved from the Northern hemisphere, Vega is seen in mid evening inMay and early evening in June (Schaaf,2008).It is also one of the star patterns, summer triangle viewed from Juneall through the rest of the year. It’s the Fifth brightest whenobserved from the earth and the third brightest when observed fromthe Northern hemisphere.
Inconclusion, there are very many bright stars, but they vary in theamount of brightness they emit. Those mentioned are only but a few,they are though the brightest stars in the sky and they are visibleto the naked eyes. There are those that are faint meaning they emitless light and therefore they cannot be noticed when you look up tothe sky. Those stars that are close to the earth do not necessarilymean they are the brightest, for example, the sun.
Schaaf,F. (2008). Thebrightest stars: Discovering the universe through the sky`s mostbrilliant stars.Hoboken, N.J: John Wiley.