Western Governors University (WGU) SCIE1020 C165 Integrated Physical Sciences Practice Exam

Comets are known for their highly elliptical orbits around the Sun. This characteristic is a fundamental aspect of their behavior and is primarily due to the gravitational influences exerted by the Sun and other celestial bodies. The orbits of comets can often extend far beyond the orbit of the outer planets and return to the inner solar system over long periods, sometimes taking hundreds or thousands of years to complete an orbit. This elongated path allows comets to travel from the far reaches of the solar system, often from regions like the Kuiper Belt or Oort Cloud, and then swing into the inner solar system, where they become visible from Earth as bright objects with tails when they approach the Sun. The highly elliptical nature of these orbits can also cause comets to make close approaches to the Sun, leading to significant heating and sublimation of their icy components, which contributes to their distinctive appearance. Other objects, such as moons, typically follow nearly circular orbits around their respective planets, and stars have inconsistent orbits that can be more circular or parabolic depending on their interactions and locations in the galaxy. Asteroids can have a variety of orbital shapes but do not predominantly feature the extreme elliptical orbits that characterize comets' paths around the Sun.