In this lesson, we will learn how to describe and determine the properties of different types of exoplanet.

Q1:

TRAPPIST-1e is an exoplanet that orbits the star TRAPPIST-1. The exoplanet orbits the star on a roughly circular orbit at a distance of 0.029 AU.

Does TRAPPIST-1e orbit its star at a smaller or at a larger orbital radius than Earthβs orbital radius around the Sun?

Use the formula π=ο4πππΊπο¨ο©, where π is the radius of the exoplanetβs orbit, π is the mass of the host star, and πΊ is the universal gravitational constant, to find π, the period of the exoplanetβs orbit. TRAPPIST-1 has a mass of 1.8Γ10ο¨ο― kg. Use a value of 6.67Γ10ο±ο§ο§ m^{3}/kgβ s^{2} for πΊ. Give your answer in days to two decimal places.

TRAPPIST-1e has a mass, π, of 4.6Γ10ο¨οͺ kg and a planet radius, π, of 5,800 km. Use the formula π=πΊππο¨ to find π, the surface gravity on TRAPPIST-1e. Give your answer to 1 decimal place.

Q2:

Which of the following is the correct definition of an exoplanet?

Q3:

Which of the following is the most correct definition of the term ice planet?

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