ASP Solar System Astronomy 1 — Questions and Answers
Question 1: Which planet in our solar system has the most known moons as of recent counts?
- Jupiter
- Saturn (Correct answer)
- Uranus
- Neptune
Correct answer: Saturn
Saturn currently holds the record for the most confirmed moons, surpassing Jupiter with over 140 discovered moons.
Question 2: What is the approximate distance from Earth to the Sun, known as one Astronomical Unit (AU)?
- 93 million miles
- 150 million km
- Both A and B are correct (Correct answer)
- 186 million km
Correct 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.
Question 3: Which region of the solar system is considered the source of long-period comets?
- Kuiper Belt
- Asteroid Belt
- Oort Cloud (Correct answer)
- Scattered Disc
Correct 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.
Question 4: What causes the seasons on Earth?
- Earth's distance from the Sun
- Earth's axial tilt of 23.5° (Correct answer)
- Solar flare activity
- Moon's gravitational pull
Correct 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.
Question 5: What is the primary composition of Jupiter's atmosphere?
- Nitrogen and oxygen
- Carbon dioxide and methane
- Hydrogen and helium (Correct answer)
- Ammonia and water vapor
Correct 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.
Question 6: Which spacecraft first provided detailed images of Pluto's surface in 2015?
- Cassini
- Voyager 2
- New Horizons (Correct answer)
- Dawn
Correct 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.
ASP Solar System Astronomy 1
Which planet in our solar system has the most known moons as of recent counts?