- What happens to a star that has died?
- Where are blue giants on the HR diagram?
- Are blue stars hotter than red?
- How long does a blue supergiant last?
- Which color star is the coolest?
- What is the hottest star in the universe?
- What happens to red giants when they die?
- What is the 3rd biggest star?
- Is the sun black?
- What are blue giants made of?
- What if our sun was a blue giant?
- How hot is a blue supergiant?
- What does a dying star become?
- How big are blue giants?
- Is Sirius a blue giant?
- What happens to blue stars when they die?
- Are Blue Giants actually blue?
- What is it called when a star dies?
- What do blue giants fuse?
- Why some stars are blue?
- What if the sun was a black hole?
What happens to a star that has died?
Once a star like the Sun has exhausted its nuclear fuel, its core collapses into a dense white dwarf and the outer layers are expelled as a planetary nebula..
Where are blue giants on the HR diagram?
Blue supergiants are found towards the top left of the Hertzsprung–Russell diagram, above and to the right of the main sequence. They are larger than the Sun but smaller than a red supergiant, with surface temperatures of 10,000–50,000 K and luminosities from about 10,000 to a million times that of the Sun.
Are blue stars hotter than red?
The surface temperature of a star determines the color of light it emits. Blue stars are hotter than yellow stars, which are hotter than red stars. … The opposite is true of a cooler star such as Betelgeuse, which has a surface temperature of about 3,400 K.
How long does a blue supergiant last?
10 million yearsTheir lifetimes are a mere 10 million years (the Sun’s is about 10 billion) – by the time the Sun has lived and died, a thousand blue supergiants could have been born, lived their fiery existence and exploded into oblivion.
Which color star is the coolest?
Red starsRed stars are the coolest. Yellow stars are hotter than red stars. White stars are hotter than red and yellow. Blue stars are the hottest stars of all.
What is the hottest star in the universe?
Eta Carinae could be as large as 180 times the radius of the Sun, and its surface temperature is 36,000-40,000 Kelvin. Just for comparison, 40,000 Kelvin is about 72,000 degrees F. So it’s the blue hypergiants, like Eta Carinae, which are probably the hottest stars in the Universe.
What happens to red giants when they die?
Like every other Star, a Red Giant dies when it has burned all it’s fuel and there is no more pressure to keep gravity pushing towards the center. … At this time the Sun will calmly shed it’s outer layers into Space and become a White Dwarf, a cool extremely Dense Star, about the size of the earth but mass of the Sun.
What is the 3rd biggest star?
The three biggest stars are KW Sagitarii (distance 9,800 light-years), V354 Cephei (distance 9,000 light-years), and KY Cygni (distance 5,200 light-years), all with radii about 1500 times that of the Sun, or about 7 astronomical units (AU).
Is the sun black?
The Sun, with an effective temperature of approximately 5800 K, is an approximate black body with an emission spectrum peaked in the central, yellow-green part of the visible spectrum, but with significant power in the ultraviolet as well.
What are blue giants made of?
Because they are massive stars with short lives, many blue giants are found in O-B associations, that are large collections of loosely bound young stars. BHB stars are more evolved and have helium burning cores, although they still have an extensive hydrogen envelope.
What if our sun was a blue giant?
The colour of a star is directly related to the temperature of a star. Sun is more or less a normal star with surface temperature around 6000K and yellow in colour. … So imagine if sun would be a blue star, it would be so hot that it would become nearly impossible for a planet at a distance as earth to sustain life.
How hot is a blue supergiant?
20,000 – 50,000 degrees CelsiusBlue 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.
What does a dying star become?
Most stars take millions of years to die. When a star like the Sun has burned all of its hydrogen fuel, it expands to become a red giant. After puffing off its outer layers, the star collapses to form a very dense white dwarf. …
How big are blue giants?
At 29 times bigger than the Sun, it is not the largest star yet found, but it is the most luminous, shining at a whopping 8.7 million solar luminosities with its incredible surface temperature of about 53,000K. It also has somewhere between 265 and 315 solar-masses, making it the most massive star yet discovered.
Is Sirius a blue giant?
Sirius, also called Alpha Canis Majoris or the Dog Star, brightest star in the night sky, with apparent visual magnitude −1.46. … It is a binary star in the constellation Canis Major. The bright component of the binary is a blue-white star 25.4 times as luminous as the Sun.
What happens to blue stars when they die?
When the biggest stars in the universe die, they may form exotic states of matter generally not seen in the universe since fractions of a second after the Big Bang. These events may generate enough energy to create catastrophic explosions, a new study finds.
Are Blue Giants actually blue?
The true monsters of the Universe are blue supergiant stars, like Rigel. These can be a blue star with surface temperatures of 20,000 – 50,000 Kelvin and can be 25 times larger than the Sun. Because they’re so large, and burn so hot, they use up their fuel very quickly.
What is it called when a star dies?
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. A supernova can shine as brightly as an entire galaxy of billions of “normal” stars. …
What do blue giants fuse?
A Deeper Look at the Astrophysics of a Blue Supergiant That’s a science called astrophysics. It reveals that stars spend the vast majority of their lives in a period defined as “being on the main sequence”. … In high-mass stars, the cores begin to fuse helium into carbon and oxygen at a rapid rate.
Why some stars are blue?
The surface temperature of Eta Carinae is 40,000 Kelvin, and it shines with much of its radiation in the ultraviolet spectrum. … So, remember, blue stars are blue because of the temperature of their surface. And they’re so hot because blue stars are much more massive than cooler stars like our Sun.
What if the sun was a black hole?
If the Sun were somehow compressed enough to become a black hole, it would be less than 6 kilometers (well under 4 miles) across. It would exert no more gravitational force on Earth or the other planets in the solar system than it does now.