"Star Formation and Lifetimes" pg. 120, question 7 A star with twice the mass of the Sun would have a rate of nuclear fusion that is the rate of fusion in the Sun. a. less than b.a little more than c. twice d.more than twice

Q: what is the luminosity-distance formula?

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Q: A star that has the same mass and radius as the Sun rotates at an angular velocity 1.2 revolutions…

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Q: 6. Determine the radius of the event horizon if a star of mass 11 × 1030 kg explodes into a…

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Q: 1. Determine the radius of the event horizon if a star of mass 11 x 1030 kg explodes into a…

A: The radius of the event horizon is, R=2GMc2

Q: 1. Determine the radius of the event horizon if a star of mass 11 x 1030 kg explodes into a…

A: Given quantities: mass of the star (M) = 11 × 1030 kg   Let the gravitational constant be denoted by…

Q: 3) indicate which locations in the H-R diagram correspond to places where the evolution is slow.…

A: Using the H-R diagram shown the places where the evoultion has been slow is identified.

Q: 1. Calculate the acceleration of gravity on A) the Earth. B) the Moon. C) a neutron star.

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Q: Astronomy) (Part A) White Dwarf Size II. The white dwarf, Sirius B, contains 0.98 solar mass, and…

A: Mass of the dwarf planet = 0.98 solar mass                                          = 1.96 * 1033 gm…

Q: A neutron star and a white dwarf have been found orbiting each other with a period of 42 minutes.…

A: Explanation: Generalized form of kepler's third law, M1+M2P2=a3 Mass of white dwarf is M1 = 1 M And…

Q: How many neutrons are in a 2.8-solar-mass neutron star? Assume the star’s mass is entirely neutrons…

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Q: A star is an example of a true blackbody.   True  False

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A: Write down the values using suitable variables. Here, c signifies the speed of light in a vacuum.

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Q: The density of Sirius B is 2×106 g/cm3 and its mass is 1.95×1030 kg. What is the radius of the white…

A: The given data are: ρ=2×106 g/cm3=2×109 kg/m3m=1.95×1030 kg Here, ρ and m represent the density and…

Q: What kind of reactions provide a star with energy

A: There are mainly two type of nuclear reactions.     1. Nuclear fission     2. Nuclear fusion   In…

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A: Consider a star.

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A: since the mass remains same , therefore the ratio of density is simply equal to reciprocal ratio of…

Q: White Dwarf Size II. The white dwarf, Sirius B, contains 0.98 solar mass, and its density is about 2…

A: It is given that, M=0.98 solar mass=0.98×1.989×1030 kg=1.95×1030 kgρ=2×106 g/cm3=2×106×103…

Q: 8 What sentence explains why a star can be much farther from Earth than the Sun, but still be…

A: The sentence that explains this is : Distance from the Earth and apparent brightness are related.

Q: 225 2025 The diagram above shows a conceptual model of a spherical star that generates and emits…

A: a) power generated in interior = volume of star  x power generated per unit cc…

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A: Doppler shift is used to determine whether a star is moving towards us or moving away from us.

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Q: Suppose we represent an ordinary star as a uniform solid rigid sphere. The star’s initial radius is…

A: Given: R1=644000 kmR2=18.3 kmT1=30 daysT2=?

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A: Given: The distance between the centers of two star is 7.17×1011 m. The mass of the larger star is…

Q: List the seven main classes of stars, from hottest to coolest.

A: The hottest stars are denoted by the letter O, with the sequence progressing through B, A, F, G, K…

Q: 3. About 50,000 years ago, a meteor crashed into the Earth near present-day Flagstraff, Arizona.…

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Q: The most massive stars in the Universe have a surface temperature that can reach over 50 000 K. Life…

A: Given:Temperature of the star, T = 43000 K

Q: (Astronomy) Supernova Ejection Times. Observations show that the gas ejected from SN 1987A is…

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Q: What is Hubble’s law?

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Q: Doppler redshift in light from a star indicates that the star is_____.

A: When there is relative motion between observer and source then there is change in frequency ( or…

Q: At least a good four or five billion from years a "dead" white now the Sun will become dwarf stac,…

A: Let original radius =  R let original mass = m Final radius = 0.01 R Initial moment of inertia =…

Q: Planetary Nebula Age. Suppose a planetary nebula is 1 pc in radius. If the Doppler shifts in its…

A: ...

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Q: . Describe what would our Sun look like from Earth if it was a massive star? Pls answer in 2-3…

A: The distance of the Sun from Earth is 93 million miles. At this distance, the sun covers an area in…

Stellar evolution

We may see thousands of stars in the dark sky. Our universe consists of billions of stars. Stars may appear tiny to us but they are huge balls of gasses. Sun is a star of average size. Some stars are even a thousand times larger than the sun. The stars do not exist forever they have a certain lifetime. The life span of the sun is about 10 billion years. The star undergoes various changes during its lifetime, this process is called stellar evolution. The structure of the sun-like star is shown below.

Red Shift

It is an astronomical phenomenon. In this phenomenon, increase in wavelength with corresponding decrease in photon energy and frequency of radiation of light. It is the displacement of spectrum of any kind of astronomical object to the longer wavelengths (red) side.