2024 UPDATE. WGU C894 Unit 1 Intro to Astronomy, Exam Review Questions and answers, 100% Accurate.

WGU C894 Unit 1 Intro to Astronomy, Exam Review Questions and answers, 100% Accurate. What is planet Earth's diameter? - -nearly 13,000km What is our moon's diameter compared to Earth's? - -our moon is 1/4 size diameter of our Earth scientific notation - -system of recording very large or very small numbers using powers of 10 ex: 380,000=3.8 x 10⁵ planet - -non self-luminous body orbiting the Sun or another star that has strong enough gravity to compress it into a spheroidal shape and to have cleared its orbital zone of debris dwarf planet - -massive enough to be compressed into a spheroid but not massive enough to clear its orbit star - -self luminous ball of hot gas that generates its own energy -includes white dwarf stellar remnants What is the diameter of the Sun compared to Earth - -the Sun is about 100x larger in diameter than Earth astronomical unit (AU) - -average distance from Earth to the Sun; 1.5x10⁸ km OR 93x10⁶ miles True or false: the orbits of planets are perfect circles - -fals