Practice Test GeeksASP - Astronomical Society of the Pacific Exam Practice Test
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Solar System Astronomy Flashcards

6 cards from real ASP practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. Which planet in our solar system has the most known moons as of recent counts?

    Answer: Saturn

    Saturn currently holds the record for the most confirmed moons, surpassing Jupiter with over 140 discovered moons.

  2. What is the approximate distance from Earth to the Sun, known as one Astronomical Unit (AU)?

    Answer: Both A and B are correct

    One AU equals approximately 93 million miles or 150 million kilometers, and both values are accepted representations of this distance.

  3. Which region of the solar system is considered the source of long-period comets?

    Answer: Oort Cloud

    The Oort Cloud, a distant spherical shell of icy bodies surrounding the solar system, is the source of long-period comets with orbital periods exceeding 200 years.

  4. What causes the seasons on Earth?

    Answer: Earth's axial tilt of 23.5°

    Earth's axial tilt of approximately 23.5° causes different hemispheres to receive varying amounts of solar radiation throughout the year, creating seasons.

  5. What is the primary composition of Jupiter's atmosphere?

    Answer: Hydrogen and helium

    Jupiter's atmosphere is primarily composed of about 89% hydrogen and 10% helium by number of molecules, similar to the Sun's composition.

  6. Which spacecraft first provided detailed images of Pluto's surface in 2015?

    Answer: New Horizons

    NASA's New Horizons spacecraft made its historic flyby of Pluto on July 14, 2015, returning the first close-up images of the dwarf planet's surface.