Stars and Galaxies
9th Edition
ISBN: 9781305120785
Author: Michael A. Seeds, Dana Backman
Publisher: Cengage Learning
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Chapter 1, Problem 7RQ
To determine
Why planets around other stars cannot be detected.
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Describe the two mains methods of detecting planets around other stars.
A planet that has a mass 2.03 times that of the Earth is orbiting a star that has the a mass 3.86 times that of our Sun. The planet orbits at an average distance of 0.75 AU. How does the gravitational force between this planet and its star compare to the force between the Sun and the Earth?
In recent years, scientists have discovered hundreds of planets orbiting other stars. Some of these planets are in orbits that are similar to that of earth, which orbits the sun (MsunMsun = 1.99 ×× 103030 kgkg) at a distance of 1.50 ×× 101111 mm, called 1 astronomical unit (1 auau). Others have extreme orbits that are much different from anything in our solar system. The following problem relates to one of these planets that follows circular orbit around its star.
WASP-32b orbits with a period of only 2.7 days a star with a mass that is 1.1 times that of the sun. How many au from the star is this planet? Assume the orbital period of earth is 365 days.
Express your answer in astronomical units.
Chapter 1 Solutions
Stars and Galaxies
Ch. 1 - Prob. 1RQCh. 1 - Prob. 2RQCh. 1 - Prob. 3RQCh. 1 - What is the difference between the Moon and a...Ch. 1 - Prob. 5RQCh. 1 - Why are light-years more convenient than miles,...Ch. 1 - Prob. 7RQCh. 1 - Prob. 8RQCh. 1 - Prob. 9RQCh. 1 - What are the largest known structures in the...
Ch. 1 - Prob. 12RQCh. 1 - Prob. 13RQCh. 1 - Prob. 14RQCh. 1 - Prob. 15RQCh. 1 - Prob. 16RQCh. 1 - Prob. 1PCh. 1 - The equatorial diameter of the Moon is 3476...Ch. 1 - Prob. 3PCh. 1 - A typical galaxy is shown on the first page of the...Ch. 1 - Prob. 5PCh. 1 - Prob. 6PCh. 1 - Prob. 7PCh. 1 - Prob. 8PCh. 1 - If the speed of light is 3.0 105 km/s, how many...Ch. 1 - Prob. 10PCh. 1 - How long does it take light to cross the diameter...Ch. 1 - Prob. 12PCh. 1 - Prob. 13PCh. 1 - Prob. 1LLCh. 1 - Prob. 2LLCh. 1 - Prob. 3LLCh. 1 - Prob. 5LLCh. 1 - Prob. 6LL
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- Why is it so hard to see planets around other stars and so easy to see them around our own?arrow_forwardWhy were giant planets close to their stars the first ones to be discovered? Why has the same technique not been used yet to discover giant planets at the distance of Saturn?arrow_forwardThe Sun was once thought to be a planet. Explain why.arrow_forward
- Why is it hard to give exact diameters for even the larger objects in the Kuiper belt?arrow_forwardAn exoplanetary system has two known planets. Planet X orbits in 290 days and Planet Y orbits in 145 days. Which planet is closest to its host star? If the star has the same mass as the Sun, what is the semi-major axis of the orbits for Planets X and Y?arrow_forwardBarnard’s Star, the second closest star to us, is about 56 trillion (5.61012) km away. Calculate how far it would be using the scale model of the solar system given in Overview of Our Planetary System.arrow_forward
- One 'day' on Planet X equals 16 Earth hours.A geostationary communications satellite orbits Planet X with an orbit radius of 500 x103 km. What is the orbit radius of I 'polar orbiting' satellite that orbits Planet X 36 timesper 'day. Express the result in km.arrow_forwardA planet is located at < - 3×1010, 8×1010, - 5×1010 > m. A star is located at < 8×1010, - 5×1010, 5×1010 > m.arrow_forward20) Planet Dwovy circles its star at a distance of 8.75 × 109 km once every 325 Earth years. The planet Spitnik circles the same star at a distance of 76.1 × 109 km. What is the orbital period of Spitnik in Earth years? a) 65,800 years b) 2570 years c) 0.004 years d) 8336 years e) 257 yearsarrow_forward
- What would your escape velocity be from a planet with a radius of 3.75 million meters and a mass of 4.44 x 1024kg?arrow_forwardThe two planets orbiting the nearby star Gliese 876 are observed to be in 2:1 resonance (i.e., the period of one is twice that of the other). The inner planet has an orbital period of 30 days. If the star’s mass is the mass of the Sun, calculate the semimajor axis of the outer planet’s orbit.arrow_forwardNearly all planets that astronomers have found orbiting other stars have been giant planets with masses more like Jupiter than Earth, and with orbits located very close to their parent stars. Does this prove that our Solar System is unique? Explain your answer.arrow_forward
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