Quiz about Neptune  Furthest Planet from the Sun
Quiz about Neptune  Furthest Planet from the Sun

Neptune -- Furthest Planet from the Sun Quiz


With Pluto's demotion from planet status, Neptune was left as our Solar System's outermost planet. How much do you know about the eighth planet from the Sun?

A multiple-choice quiz by EnglishJedi. Estimated time: 3 mins.
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Author
EnglishJedi
Time
3 mins
Type
Multiple Choice
Quiz #
360,028
Updated
Dec 03 21
# Qns
10
Difficulty
Average
Avg Score
7 / 10
Plays
367
Awards
Top 35% Quiz
Last 3 plays: xchasbox (9/10), Guest 107 (9/10), Guest 187 (7/10).
This quiz has 2 formats: you can play it as a or as shown below.
Scroll down to the bottom for the answer key.
1. Mars is often described as 'the Red Planet'. Which color does Neptune appear to be? Hint

Blue
Yellow
Green
White

2. What is the main component of Neptune's atmosphere? Hint

Methane
Helium
Hydrogen
Oxygen

3. The vast distances in space are not easy to comprehend. If the distance from the Sun to Earth is measured at 1 AU (Astronomical Unit), how far is it from the Sun to Neptune? Hint

15 AU
30 AU
5 AU
90 AU

4. Jupiter has 67 moons, Saturn 62, but Neptune a relatively small 13. Which of Neptune's moons is the largest? Hint

Triton
Callisto
Proteus
Titania

5. After what are Neptune's moons named? Hint

William Shakespeare characters
Sea gods
Lovers and descendants of Zeus
Alexander Pope characters

6. Neptune is the fourth-largest planet in the solar system, but how much larger than Earth is it? Comparing surface areas of the two planets, how many times would the Earth's entire surface area fit onto Neptune? Hint

125 times
3 times
15 times
40 times

7. In which year was Neptune officially discovered as a planet? Hint

1612
1930
1753
1846

8. Approximately how many Earth years does it take for Neptune to make a single revolution around the Sun? Hint

165
84
12
264

9. Which spacecraft visited Neptune in 1989? Hint

Voyager 1
Voyager 2
Discovery 1
New Horizons

10. Gustav Holst's "The Planets" suite allocates each planet a corresponding astrological character. How is Neptune known in this respect? Hint

The Magician
The Mystic
Bringer of Old Age
Bringer of Peace


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Quiz Answer Key and Fun Facts
1. Mars is often described as 'the Red Planet'. Which color does Neptune appear to be?

Answer: Blue

The outer layers of Neptune's atmosphere are formed by clouds of methane ice. Methane absorbs red light, thus accounting for the planet's blue appearance.
2. What is the main component of Neptune's atmosphere?

Answer: Hydrogen

Neptune has an atmosphere with a scale height of close to 20km. Its primary component is hydrogen, accounting for between 77-83% of the atmosphere. The second biggest component is helium (16-22%). Methane is the third largest component (1-2%). There are also traces of hydrogen deuteride and ethane.
3. The vast distances in space are not easy to comprehend. If the distance from the Sun to Earth is measured at 1 AU (Astronomical Unit), how far is it from the Sun to Neptune?

Answer: 30 AU

Given that it is 1 AU from the Sun to Earth, going outwards it is just less than 1.5 AU from the Sun to Mars, and 5 AU from the Sun to Jupiter. The distances then start to become really large: from the Sun to Saturn varies from 9-10 AU and from the Sun to Uranus from 18-20 AU.

It is 30 AU from the Sun to Neptune. To give you a sense of perspective, imagine that the distance from the Sun to Neptune is a 100-yard football field. The Sun is a little smaller than a golf ball on this scale at one end of the field, and Neptune, about a tenth of that size on the other goal line.

The Earth, which would be smaller than a flea, is located between he 1-yard and 2-yard line at the Sun's end of the field. Suffice it to say that it is a long, long way to Neptune!
4. Jupiter has 67 moons, Saturn 62, but Neptune a relatively small 13. Which of Neptune's moons is the largest?

Answer: Triton

Triton is enormous compared to all of the other moons of Neptune. With a radius of 1,530 km, it is about 80% of the size of our Moon (1,737 km). By comparison, the second-largest of Neptune's moons, Proteus, has a radius of jut 210 km. Triton accounts for 99.5% of the total mass of all 13 of Neptune's moons.
Triton is the seventh-largest satellite in the Solar System, although it is almost exactly half the size of the largest, Jupiter's Ganymede, which has a radius of 2,634 km. Triton is the only large moon in the Solar System with a retrograde orbit -- i.e. it orbits in a direction opposite to its planet's rotation.
When measured in 1989, Triton was found to be the coldest known place in the Solar System with estimated temperature of -235 C.
Of the alternatives, Callisto is the second-largest of Jupiter's moons, Titania is the largest moon of Uranus, and Proteus is Neptune's second-largest moon.
5. After what are Neptune's moons named?

Answer: Sea gods

Since Neptune is the Roman God of the sea, its moons are named after lesser sea-related Gods. Its largest moon, Triton, is named after the Greek sea god who was the son of Poseidon.
Of the alternatives, the moons of Jupiter that were discovered before 2004 are named after lovers and favorites of Zeus. Those discovered after 2004 are named after the daughters of either Jupiter or Zeus. The moons of Uranus are named after the characters of William Shakespeare and Alexander Pope.
6. Neptune is the fourth-largest planet in the solar system, but how much larger than Earth is it? Comparing surface areas of the two planets, how many times would the Earth's entire surface area fit onto Neptune?

Answer: 15 times

The earth has a surface area of about 510,000,000 square km. Neptune's surface area is about 7,618,300,000 sq km: about 15 times the size of Earth. To put this figure into context, Earth is the equivalent to the size of Canada if Neptune is the size of all the land on Earth. In the equivalent comparison using the entire surface of the Earth (70% of which is covered with water) inflated to the size of Neptune, Earth would then be about twice the size of Russia.
7. In which year was Neptune officially discovered as a planet?

Answer: 1846

Neptune was first seen by Galileo in 1612, but he mistook it for a star. In 1821, French astronomer Alexis Bouvard was studying the orbit of Uranus and he hypothesized the existence of an eighth planet in the solar system. This was confirmed 25 years later by three astronomers, Frenchman Urbain Le Verrier, Germany's Johann Gottfried Galle and England's John Couch Adams.

The official date of discovery of Neptune is September 23, 1846. It remained the furthest planet from the Sun until Pluto was discovered in 1930, and then regained that status in 2006 when Pluto was reclassified as a 'dwarf planet'.
8. Approximately how many Earth years does it take for Neptune to make a single revolution around the Sun?

Answer: 165

In 2011, Neptune completed its first complete orbit of the Sun since its discovery in 1846. It takes Neptune 60,190 Earth days (164.79 years) to make a single complete revolution of the Sun. I doubt anyone on Neptune complains about how quickly Christmas comes around!
The alternatives are the approximate orbit times of other bodies in the Solar System -- Jupiter takes roughly 12 Earth years (11.86 exactly) to orbit the Sun, Uranus orbits every 84 Earth years (84.32), and Pluto takes almost exactly 264 Earth years.
9. Which spacecraft visited Neptune in 1989?

Answer: Voyager 2

By the time Voyager 2 reached Neptune, it took just over four hours for a signal to travel from the spacecraft back to Earth. It passed within 4,400 km of Neptune's atmosphere before passing close to Triton later the same day. Six new moons were discovered and Neptune was shown to have more than one ring and a seriously active weather system.
Voyager 1 had earlier performed a similar fly-by of Saturn. The New Horizons probe was scheduled to fly close to Pluto in 2015.
10. Gustav Holst's "The Planets" suite allocates each planet a corresponding astrological character. How is Neptune known in this respect?

Answer: The Mystic

The last of the seven movements in Holst's "The Planets" suite is "Neptune, the Mystic". Uranus is "The Magician", Saturn the "Bringer of Old Age" and Venus the "Bringer of Peace".
Source: Author EnglishJedi

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