- What is the biggest known star in the universe?
- What star will the sun become?
- Why do stars twinkle?
- Why do sunspots appear dark in pictures of the sun?
- Is the sun black?
- What color is the coolest star?
- Is the sun White?
- Is the sun a main sequence star quizlet?
- What is Corona of Sun?
- What is the real color of sun?
- Is our Sun considered a main sequence star?
- What type of star is our sun quizlet?
- What is a white star?
- Can the Sun become a black hole?
- How many stars are there?
- What can we learn about a star from a life track on an HR diagram?
- Which is the nearest star to Earth?
What is the biggest known star in the universe?
The largest known star in the universe is UY Scuti, a hypergiant with a radius around 1,700 times larger than the sun..
What star will the sun become?
Ultimate Fate of our Sun: As such, when our Sun runs out of hydrogen fuel, it will expand to become a red giant, puff off its outer layers, and then settle down as a compact white dwarf star, then slowly cooling down for trillions of years.
Why do stars twinkle?
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 sunspots appear dark in pictures of the sun?
Sunspots appear dark (in visible light) because they are much cooler than the rest of the surface of the Sun. However, even though they appear dark, they are still very hot. … If a sunspot was alone in space, it would glow brightly.
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 color is the coolest star?
redThe hottest stars tend to appear blue or blue-white, whereas the coolest stars are red. A color index of a star is the difference in the magnitudes measured at any two wavelengths and is one way that astronomers measure and express the temperature of stars.
Is the sun White?
Around sunrise and sunset, when the sunlight travels through a lot more atmosphere than usual, sunlight on earth’s surface becomes even more red. But the sun itself is white. Sunlight spectrum in space as a function of wavelength.
Is the sun a main sequence star quizlet?
Terms in this set (12) A normal star that is undergoing nuclear fusion of hydrogen into helium. Our sun is a typical main sequence star.
What is Corona of Sun?
The Sun’s corona is the outermost part of the Sun’s atmosphere. The corona is usually hidden by the bright light of the Sun’s surface. … However, the corona can be viewed during a total solar eclipse. Our Sun is surrounded by a jacket of gases called an atmosphere.
What is the real color of sun?
But, as can be seen in the image above, it emits most of its energy around 500 nm, which is close to blue-green light. So one might say that the sun is blue-green! This maximum radiation frequency is governed by the sun’s surface temperature, around 5,800K.
Is our Sun considered a main sequence star?
Main sequence stars fuse hydrogen atoms to form helium atoms in their cores. About 90 percent of the stars in the universe, including the sun, are main sequence stars.
What type of star is our sun quizlet?
The Sun is a type G2 star. It has a surface temperature of just under 6000 K. Its absolute magnitude is about a +5.
What is a white star?
A white dwarf is what stars like the Sun become after they have exhausted their nuclear fuel. Near the end of its nuclear burning stage, this type of star expels most of its outer material, creating a planetary nebula. Only the hot core of the star remains.
Can the Sun become a black hole?
Will the Sun become a black hole? No, it’s too small for that! The Sun would need to be about 20 times more massive to end its life as a black hole. … In some 6 billion years it will end up as a white dwarf — a small, dense remnant of a star that glows from leftover heat.
How many stars are there?
Astronomers estimate there are about 100 thousand million stars in the Milky Way alone. Outside that, there are millions upon millions of other galaxies also!
What can we learn about a star from a life track on an HR diagram?
What can we learn about a star from a life track on an H-R diagram? The surface temperature and luminosity the star will have at each stage of its life. When does a protostar become a main-sequence star?
Which is the nearest star to Earth?
Proxima CentauriOf the three stars in the system, the dimmest – called Proxima Centauri – is actually the nearest star to the Earth.