21st Century Astronomy (sixth Edition)
6th Edition
ISBN: 9780393675504
Author: Laura Kay, Stacy Palen, George Blumenthal
Publisher: W. W. Norton & Company
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Chapter 7, Problem 20QP
To determine
Explain about scientist reaction for new exoplanets that are not formed from the collapse of a stellar nebula.
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Students have asked these similar questions
Kepler-444 is one of many stars with terrestrial planets that is over 10 billion
a) What do you think the spectral type of Kepler-444 might be?
b) How do stars of this spectral type end their lives?
c) If evolution followed a similar course on a habitable pranet around a star similar to
Kepler-444, it would be 5 billion years more advanced than we are. Let’s try to project
our future and see what happens. In particular, suppose our civilization gets motivated
enough to colonize another planet. Kepler indicates that most stars have potentially
habitable (and colonizable) planets, so roughly how far away is the typical “nearest"
planet?
d) The New Horizons probe on its way to Pluto took 9 years to travel 30 AU. If we could
send colony ships with the same average speed, roughly how long would it take to reach
the typical nearest planet?
уears
old.
Exoplanets have many kinds, and we like to put them in boxes based on some
properties such as mass, radius, and distance from their host star.
Fill in the blank. A planet that is 5 times the massive of Jupiter, and orbits at 0.1 au
from its central star, is a
type of exoplanet
What are the four main challenges that need to be overcome as scientists come together to try to get a probe to an exoplanet
Chapter 7 Solutions
21st Century Astronomy (sixth Edition)
Ch. 7.1 - Prob. 7.1CYUCh. 7.2 - Prob. 7.2CYUCh. 7.3 - Prob. 7.3CYUCh. 7.4 - Prob. 7.4CYUCh. 7.5 - Prob. 7.5CYUCh. 7 - Prob. 1QPCh. 7 - Prob. 2QPCh. 7 - Prob. 3QPCh. 7 - Prob. 4QPCh. 7 - Prob. 5QP
Ch. 7 - Prob. 6QPCh. 7 - Prob. 7QPCh. 7 - Prob. 8QPCh. 7 - Prob. 9QPCh. 7 - Prob. 10QPCh. 7 - Prob. 11QPCh. 7 - Prob. 12QPCh. 7 - Prob. 13QPCh. 7 - Prob. 14QPCh. 7 - Prob. 15QPCh. 7 - Prob. 16QPCh. 7 - Prob. 17QPCh. 7 - Prob. 18QPCh. 7 - Prob. 19QPCh. 7 - Prob. 20QPCh. 7 - Prob. 21QPCh. 7 - Prob. 22QPCh. 7 - Prob. 23QPCh. 7 - Prob. 24QPCh. 7 - Prob. 25QPCh. 7 - Prob. 26QPCh. 7 - Prob. 27QPCh. 7 - Prob. 28QPCh. 7 - Prob. 29QPCh. 7 - Prob. 30QPCh. 7 - Prob. 31QPCh. 7 - Prob. 32QPCh. 7 - Prob. 33QPCh. 7 - Prob. 34QPCh. 7 - Prob. 35QPCh. 7 - Prob. 36QPCh. 7 - Prob. 37QPCh. 7 - Prob. 38QPCh. 7 - Prob. 39QPCh. 7 - Prob. 40QPCh. 7 - Prob. 41QPCh. 7 - Prob. 42QPCh. 7 - Prob. 43QPCh. 7 - Prob. 44QPCh. 7 - Prob. 45QP
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- If a star must remain on the main sequence for at least 4 billion years for life to evolve to intelligence, what is the most massive a star that can form and still possibly harbor intelligent life on one of its exoplanets? (Hints: Use the formula for stellar life expectancies, Eq. 121, and data in Appendix Table A-7.)arrow_forwardH5. A star with mass 1.05 M has a luminosity of 4.49 × 1026 W and effective temperature of 5700 K. It dims to 4.42 × 1026 W every 1.39 Earth days due to a transiting exoplanet. The duration of the transit reveals that the exoplanet orbits at a distance of 0.0617 AU. Based on this information, calculate the radius of the planet (expressed in Jupiter radii) and the minimum inclination of its orbit to our line of sight. Follow up observations of the star in part reveal that a spectral feature with a rest wavelength of 656 nm is redshifted by 1.41×10−3 nm with the same period as the observed transit. Assuming a circular orbit what can be inferred about the planet’s mass (expressed in Jupiter masses)?arrow_forwardDescribe the Doppler Method of searching for exoplanets.arrow_forward
- If you could visit another planetary system while the planets are forming, would you expect to see the condensation sequence at work, or do you think that process was most likely unique to our Solar System? How do the properties of the extrasolar planets discovered so far affect your answer? Do you expect the most planetary system in the Universe have analogs to our Solar System’s asteroid belt and Kuiper Belt? Would all planetary systems show signs of an age of heavy bombardment? If the solar nebula hypothesis is correct, do you think there are more planets in the Universe than stars? Why or why not?arrow_forwardList any similarities between discovered exoplanets and planets in our solar system.arrow_forwardDescribe the Nebular Theory. Include A) what it is, B)what happened, and C) at least three lines of evidence to support it.arrow_forward
- Using high resolution adaptive optical techniques, observations of a nearby (9.5 pc) cool star of mass 0.2 solar masses indicate the presence of a small rocky exoplanet in a circular orbit with a radius of 0.01 arcseconds. Using Kepler's Laws, estimate the period of the exoplanet's orbit in days. select units Aarrow_forwardWhich of the following statements are true? Choose all that apply. If light from a star passes through an exoplanet's atmosphere, we can look at the absorption spectra to determine what elements & compounds are in the atmosphere. The reason astronomers want telescopes with large primary mirrors is to gather as much light as possible. In crown glass, the index of refraction for red light is 1.512 and for yellow light it is 1.518. Thus in crown glass, red light is slower than yellow light. If the axes of two polarizers are anti-parallel to each other, then no light will get through. The glasses for nearsighted people create real images for them to see. The larger the diameter of an optic is, the smaller the minimum angle it can discern is.arrow_forwardWhich is these facts is NOT explained by the nebular theory? There are two main types of planets: terrestrial and jovian Existance of comets and asteroids Planets orbit in the same direction and plane Number of planets of each type (4 terrestrial and 4 jovian)arrow_forward
- Is there an exoplanet detection method that works better with detecting exoplanets that are at a large distance from their host star? a) none b) radial velocity method c) direct detection d) transit methodarrow_forwardFor the following light curve, which of the answers best illustrates the orientation of the exoplanet and its host star during the dip at Time 3? Light curve Time 1 Time 2 Time 3 Time 4 Choose one: А. O C. D. Intensity B.arrow_forwardIf there was a planet orbiting a first generation star, which planet in our solar system would it resemble most? Would it be likely for such a planet to have life?arrow_forward
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