- What star is very dim and red in color?
- What is the longest a star can live?
- What star is the coldest?
- What is the difference between a star and a sun?
- What color is a dying star?
- What’s the closest star to our sun?
- Which color star is hottest?
- Which color star is the coolest?
- Can a star live forever?
- What is the relationship between temperature and star brightness?
- Why do stars twinkle?
- Why do star have colors?
- Which star on the HR diagram has the longest lifetime?
- Which star has the shortest lifespan?
- What type of star is cool and dim?
- What is the death of a star?
- Why do stars begin to die?
- Is our sun a red giant?
- Is our sun a red dwarf?
- Which star is the hottest supergiant?
- What does HR diagram tell us about stars?
What star is very dim and red in color?
Describe stars A, B, C, and D in terms of their brightness and temperature.
Star A is red and therefore, cool.
Its luminosity is 1/1000 of that of the sun; therefore, it is dim..
What is the longest a star can live?
The Life Cycle of a High-Mass Star Generally, the bigger a star is, the faster it uses up its supply of nuclear fuel, so the longest-lived stars are among the smallest. The stars with the longest lifetimes are red dwarfs; some may be nearly as old as the universe itself.
What star is the coldest?
According to a new study, a star discovered 75 light-years away is no warmer than a freshly brewed cup of coffee. Dubbed CFBDSIR 1458 10b, the star is what’s called a brown dwarf.
What is the difference between a star and a sun?
First of all, a star is a luminous celestial body, just like our sun. … If its mass is great enough for fusion to occur, it’s a star. So the biggest difference between a star and a planet is that a sun is massive enough for fusion. A moon is a celestial body orbiting a planet or asteroide.
What color is a dying star?
The dead star, called a white dwarf, can be seen at the center of the image as a white dot. All of the colorful gaseous material seen in the image was once part of the central star, but was lost in the death throes of the star on its way to becoming a white dwarf.
What’s the closest star to our sun?
Alpha Centauri AOf the three stars in the system, the dimmest – called Proxima Centauri – is actually the nearest star to the Earth. The two bright stars, called Alpha Centauri A and B form a close binary system; they are separated by only 23 times the Earth – Sun distance.
Which color star is hottest?
blueStars have different colors, which are indicators of temperature. The hottest stars tend to appear blue or blue-white, whereas the coolest stars are red.
Which color star is the coolest?
Red starsYou can tell the temperature of the star. Red stars are the coolest. Yellow stars are hotter than red stars. White stars are hotter than red and yellow.
Can a star live forever?
No. Stars are born, live, and die. This process is called the “life cycle of a star”. Most of the time a star shines, it is in a stage of its life cycle called the main sequence.
What is the relationship between temperature and star brightness?
A star’s brightness, or luminosity, depends on the star’s surface temperature and size. If two stars have the same surface temperature, the larger star will be more luminous. The Hertzsprung-Russell (H-R) diagram below is a scatter plot that shows the relative temperatures and luminosities of various stars.
Why do stars twinkle?
In fact, most of the stars are shining with a steady light. The movement of air (sometimes called turbulence) in the atmosphere of Earth causes the starlight to get slightly bent as it travels from the distant star through the atmosphere down to us on the ground. … To our eyes, this makes the star seem to twinkle.
Why do star have colors?
The color of a star is linked to its surface temperature. The hotter the star, the shorter the wavelength of light it will emit. The hottest ones are blue or blue-white, which are shorter wavelengths of light. Cooler ones are red or red-brown, which are longer wavelengths.
Which star on the HR diagram has the longest lifetime?
Hertzsprung-Russel (HR) diagramMost stars fall on the Main Sequence.On the Main Sequence, the more massive stars are bigger, hotter, more luminous, and die faster.The life span of stars ranges from about 10 million years for the blue giants to about 100 billion years for the red dwarfs.More items…•
Which star has the shortest lifespan?
The most massive stars have the shortest lifetimes. Because they have most fuel, they burn it so prodigously that their lifetimes are very short. A stars time on the main sequence varies from a few million to 2×1011.
What type of star is cool and dim?
Stars which lie along the top right of the diagram are luminous and cool and are known as supergiants. Fainter, hotter stars – which appear at the bottom left of the diagram – are known as white dwarfs. Hot and bright stars are located at the top left of the diagram, and cool, dim stars at the bottom right.
What is the death of a star?
When a star like the Sun has burned all of its hydrogen fuel, it expands to become a red giant. This may be millions of kilometres across – big enough to swallow the planets Mercury and Venus. After puffing off its outer layers, the star collapses to form a very dense white dwarf.
Why do stars begin to die?
Stars die because they exhaust their nuclear fuel. … Really massive stars use up their hydrogen fuel quickly, but are hot enough to fuse heavier elements such as helium and carbon. Once there is no fuel left, the star collapses and the outer layers explode as a ‘supernova’.
Is our sun a red giant?
In approximately 5 billion years, the sun will begin the helium-burning process, turning into a red giant star. When it expands, its outer layers will consume Mercury and Venus, and reach Earth. The changing sun may provide hope to other planets, however. …
Is our sun a red dwarf?
The sun is classified as a G-type main-sequence star, or G dwarf star, or more imprecisely, a yellow dwarf. Actually, the sun — like other G-type stars — is white, but appears yellow through Earth’s atmosphere. … The sun will puff up into a red giant and expand past the orbit of the inner planets, including Earth.
Which star is the hottest supergiant?
Blue supergiant star. Blue supergiants are supergiant stars (class I) of spectral type O. They are extremely hot and bright, with surface temperatures of between 20,000 – 50,000 degrees Celsius. The best known example is Rigel, the brightest star in the constellation of Orion.
What does HR diagram tell us about stars?
Developed independently in the early 1900s by Ejnar Hertzsprung and Henry Norris Russell, it plots the temperature of stars against their luminosity (the theoretical HR diagram), or the colour of stars (or spectral type) against their absolute magnitude (the observational HR diagram, also known as a colour-magnitude …