4. What is the distance in kilometers to a star that is 4.2 light years away?

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: A light-year is defined as the distance traveled by light in a vacuum during one tropical year. How…

A: Given data: A light-year is defined as the distance traveled by light in a vacuum during one…

Q: The Sun’s angular diameter is measured to be 1920′′. The distance D of the Sun from the Earth is…

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Q: What is Astronomy

A: Astronomy is the study of celestial bodies and phenomena that occur outside the earth atmosphere. It…

Q: 1. The diameter of the Sun is 1,391,400 km. The diameter of the Moon is 3,474.8 km. Find the ratio,…

A: Given data, Diameter of the sun, S1S2 = 1391400 km Diameter of the moon, M1M2 = 3474.8 km Distance…

Q: Q8. Measured the parallax angle of the Sirius Yanmaniya star, see Figure, and found 0.377 arcsec.…

A: Given :  Parallax angle of Sirius Yamaniya star, p* =0.377 arcsec

Q: 7. Solve for the distance to Alpha Centauri in light years if the measured parallax shift is 0.749…

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Q: A Spinning Star has a period of rotation of T. Over a period of a million years, its radius…

A: Write the expression for the initial period of the given star, and solve for its initial angular…

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Q: 3. Use the chart given to answer the following Height above earth ) tquatorial Radius (m) orbital…

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Q: Brightness of a Star The luminosity of a star is L = 2.5 x 106 W, and its distance from the earth is…

A: The relationship between brightness, B, luminosity, L, and distance, d, is given as, B=L4πd2

Q: late the distance of a star if you knowt

A: The formula for the distance to a star based on it apparent and absolute magnitude is: d =…

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A: We have to identify if the given statement 'A star is an example of a true blackbody' is true or…

Q: Mention what is the speed of light in space?

A: The speed/velocity of light is different in different media. Light is an electromagnetic radiation.…

Q: A star spans a parallax angle θ = 2 arcsecond when seen on Earth (6 months spans 2θ).  Its distance…

A: The astronomers use the unit Parsec, for measuring the distance. 1 parsec is the distance to a star…

Q: The distance light travels in one second(one light-second) is about 1.86×10⁵ mi. Saturn is about 475…

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Q: 7. Over the course of 6 months, a star's parallax angle is measured to be 0.083 arcseconds. What is…

A: Given. The parallel angle = 0.083 seconds. Cource is 6 months  Radius of rotation of earth is…

Q: Part 2: Each statement has a missing word, write the appropriate word to complete the thought of the…

A: The above question explain the theory of how how the astronomy came into existence.

Q: Part 2 of 3 Now we can use the small angle formula to calculate the distance (in pc). 2.06 x 105 D =…

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Q: 3. Consider two stars with my = 2.2 and my on whether your answer is plausible. --1.5. What is their…

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Q: 2. Suppose an absorption line in a spectrum of light from a very distant galaxy is 5015 Angstroms.…

A: Write the expression for the Dopler’s effect and solve for the speed (v) of the separation, that is…

Q: 1). A star has six times the radius of the Sun (Appendix C) and a temperature of 2000 K. Find its…

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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…

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. For an observer located on the equator, the altitude of the stars due West will...   A)…

A: Practically, the distance with stars from earth is soo huge so the difference is almost negligible.

Q: Galileo's telescope brought about revolutionary changes in astronomy. A comparable leap in our…

A: Given data *The space telescope brightness of the faintest object is I2 = (I1/50) Let d1 be the…

Q: 2. The diameter of our Milky Way is roughly - 105 ly(light-year). Planet X at the edge of our Milky…

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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: 1) The Earth's orbital speed is approximately 30 km/s. A star emits a spectral line with 2=517.3 nm.…

A: The oscillation is set up due to the doppler effect.

Q: Given these values and the properties of the eye, from how far away can you see (detect) the Sun?…

A: In this problem, it is asking from how much distance we can see the sun (Only question 4).

Q: 5. The nearest star to the Sun is Proxima Centauri, a red dwarf star at a distance of 4.243 ly. Its…

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Q: 1. What are the two most abundant elements found in stars?

A: Hydrogen and Helium are the two most abundant elements found in stars. Protons and neutrons fused to…

Q: Q9. If the luminosity of star B is 25 times the luminosity of star A, then find the distance of star…

A: Luminosity is an absolute measure of radiant power; that is, its value is independent of an…

Q: 1-What are some common constellations seen in the sky? 2-Why do scientists study constellations?

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Q: 2) Roughly (within .25 of a year) how long will it take you to travel to Alpha Centauri in the…

A: Given : The question asked is : Roughly (within .25 of a year) how long will it take you to travel…

Q: At rest hydrogen has a spectral line at 149nm. If this line is observed at 144 nm for the star…

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Q: 4.11,80.10 m³Is) Va= Vnz 3,14.(2.50 cm . 10

A: V = 4 * ( 1.8 * 10-4 m3/s)3.14 * (2.5 cm * 10-2m)2V = 7.2 * 10-43.14 * 6.25 * 10-4

Q: Why study astronomy

A: Astronomy is a very old science. It is the science dealing with the characteristics of celestial…

Q: Q10: If you know that the difference of the apparent magnitude between two stars is equal to 5…

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Q: What is unit of Astronomical distance ?   A) light year B) angstrom C) weber D) lux

A: Astronomical distance is used by astronauts to measure distance in space. In space distance's unit…

Q: 13.1 kryp eyep that 2 Find Ans.

A: GivenD=100 cm=1 m