8 What sentence explains why a star can be much farther from Earth than the Sun, but still be bright? ida nedw A. Distance from Earth and apparent brightness are related. B. Bright stars that are farther away are larger than the Sun. C. The higher it appears in the sky, the brighter the star. D. The apparent brightness scale goes up as stars get dimmer. dto

Q: In order to form a black hole, a star must be about how much more massive than our Sun? a. Fifty…

A: As per the Theory of black hole, When a big giant star is dead, The star Formed in to black hole.…

Q: object. Apparent magnitude is how Y8ur eye. Generally, the brighter the object, the closed it is to…

A: “Since you have posted a question with multiple sub-parts, we will solve first three subparts for…

Q: Solve only c,d option. thee evolution of a star is determined uniquely by its…

A:

Q: Which of the following can explain how we can calculate distances to stars despite being able to…

A: Parallax is a technique used to measure the distance to a star by observing its apparent shift in…

Q: Two stars are in a closely orbiting binary system. The smaller star (a K-type main sequence star)…

A: The correct option. Following the mass transfer, which of the following is now true of the main…

Q: The closest star to the Earth (other than the sun) is Alpha Centauri, which is 4.3 light years away…

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Q: 3. A light year is a unit that measures- A. Time B. Size C. Distance D. Temperature O A O B O c

A:

Q: As seen from Earth, a star has a transverse velocity of 96 km/s and a radial velocity of 64 km/s.…

A: The space velocity (V) of the star with respect to Earth is given by:   V = √(V_r^2 + V_t^2)   where…

Q: If the Sun's distance were three times its current distance, the "surface brightness" (apparent…

A: Distance is increased by 3 times  That means r= 3R  R is the initial distance

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A: We can define an average star as:  An average star, or more properly, an intermediate-mass star,…

Q: Suppose you observe a tight eclipsing binary with orbital period of 3 days, and radial velocity…

A: 1. Suppose you observe a tight eclipsing binary with orbital period of 3 days, and radial velocity…

Q: A light curve measures   a. luminosity vs. temperature.   b. mass vs. luminosity.   c. diameter…

A: A light curve is a graph that shows the brightness of an object over a period of time.

Q: c) What is its bolometric absolute magnitude if its bolometric correction is equal to -0.30 ? d)…

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Q: Doppler broadening of spectral lines. Given that K= (1+vx/c), then Arms is: O a. b. KT/mc

A: Given that λ=λo(1+VxC). Then to find λrms is given below.

Q: . Imagine a giant sphere with a radius of 1 AU surrounding the Sun. What is the surface area of this…

A: "Since you have posted a question with multiple sub-parts, we will solve the first three subparts…

Q: Calculate the distance of a star if the stellar spectrum indicates an absolute magnitude of -10.0,…

A: Given,Absolute magnitude, M =- 10Apparent magnitude, m = 5From magnitude distance formula,m -M = 5…

Q: We observe an increase in brightness of a star that is 5.81×10¹⁹ m away. How long ago did the actual…

A: Distance of star = 5.81 × 1019 m Speed of light = 3 ×108 m/s

Q: subject: astronomy) 1. When do you say a star is very hot compared to the red. 2. are stars of equal…

A: Answer (1) A blue star will always be hotter than the red star. It is independent of the relative…

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Q: A bright red star is moving towards Earth. Which of the choices best completes the following…

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Q: 5. The Luyten 762-8 star system contains two stars, one with apparent 12.5 and the other with m =…

A: Given :  mVega =0 , m1 = 12.5 and m2 =12.9 Concept : mVega - m = 2.5 log(L/LVega)

Q: 1. Sirius A has an apparent magnitude of 4.72, determine its luminosity.

A: Please see the next step for solution:-

Q: 3- Consider a binary star system in which the two stars are seen to be 1.50" apart. Determine the…

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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.