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Space science · Grades 4–5

Solar System Quiz Worksheet: 10 Questions

A one-page fact sheet on the eight planets with NASA photos and NASA facts, followed by a 10-question quiz. The answer key is on its own page. Switch to version B or C for a new set, or open it in the builder to change anything.

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Version A · 2 pages + answer key · prints on US Letter or A4Customize version A

Science · SpaceAges 8–12 · Grades 3–6

Our Solar System

Eight planets circle the Sun. Read about each one, then try the quiz.

NameDate
1st from the SunMercury, NASA imageNASA/JHUAPL/CIW

Mercury

A year here lasts just 88 Earth days, the shortest of any planet.

Across
3,032 mi
Day
176 Earth days
Year
88 Earth days
Rings
No
2nd from the SunVenus, NASA imageNASA/JPL-Caltech · Mariner 10

Venus

The hottest planet: about 867°F (464°C) on average.

Across
7,521 mi
Day
117 Earth days
Year
225 Earth days
Rings
No
3rd from the SunEarth, NASA imageNASA · Suomi NPP

Earth

Our home is the densest of all eight planets.

Across
7,926 mi
Day
24 hours
Year
365 days
Rings
No
4th from the SunMars, NASA imageNASA/JPL/USGS

Mars

A day on Mars lasts 24.7 hours, close to a day on Earth.

Across
4,221 mi
Day
24.7 hours
Year
687 Earth days
Rings
No
5th from the SunJupiter, NASA imageNASA/JPL/Univ. of Arizona · Cassini

Jupiter

The biggest planet: about 11 Earths would fit across it.

Across
88,846 mi
Day
9.9 hours
Year
about 12 Earth years
Rings
Yes
6th from the SunSaturn, NASA imageNASA/JPL/Space Science Inst.

Saturn

For its size, Saturn is so light it is less dense than water.

Across
74,897 mi
Day
10.7 hours
Year
about 29 Earth years
Rings
Yes
7th from the SunUranus, NASA imageNASA/JPL-Caltech · Voyager 2

Uranus

Tilted about 98°, it spins on its side as it circles the Sun.

Across
31,763 mi
Day
17.2 hours
Year
about 84 Earth years
Rings
Yes
8th from the SunNeptune, NASA imageNASA/JPL · Voyager 2

Neptune

The farthest planet: about 30 times farther from the Sun than Earth.

Across
30,775 mi
Day
16.1 hours
Year
about 164 Earth years
Rings
Yes

Real NASA spacecraft images; NASA processed the colors of some. Not shown to scale. “Day” means sunrise to sunrise.

Quick quiz

  1. 1.Which planet is closest to the Sun?
  2. 2.Which planet is the biggest?
  3. 3.Venus is not the closest planet to the Sun, but it is the ________ planet.
  4. 4.Which planet spins on its side?
  5. 5.Put these in order, starting closest to the Sun: Saturn, Earth, Neptune, Mars.
  6. 6.Which planet is farthest from the Sun?
  7. 7.Which planet is the smallest?
  8. 8.How many of the eight planets have rings?
Photos: NASA (JPL-Caltech, JHU APL, USGS, Univ. of Arizona, Space Science Institute). Facts: NASA Planetary Fact Sheet.More free worksheets: handeware.com/learn
Science · SpaceAges 8–12 · Grades 3–6

Our Solar Systemcontinued

Quick quiz

  1. 9.On which planet is one day longer than one year?
  2. 10.Which planet is less dense than water?
Photos: NASA (JPL-Caltech, JHU APL, USGS, Univ. of Arizona, Space Science Institute). Facts: NASA Planetary Fact Sheet.More free worksheets: handeware.com/learn
Science · SpaceAges 8–12 · Grades 3–6

Our Solar SystemANSWER KEY

Answers to the quick quiz, with the NASA numbers behind every fact on the sheet.

Quiz answers

  1. 1.Which planet is closest to the Sun?Mercury
  2. 2.Which planet is the biggest?Jupiter
  3. 3.Venus is not the closest planet to the Sun, but it is the ________ planet.hottest
  4. 4.Which planet spins on its side?Uranus
  5. 5.Put these in order, starting closest to the Sun: Saturn, Earth, Neptune, Mars.Earth, Mars, Saturn, Neptune
  6. 6.Which planet is farthest from the Sun?Neptune
  7. 7.Which planet is the smallest?Mercury
  8. 8.How many of the eight planets have rings?Four: Jupiter, Saturn, Uranus and Neptune
  9. 9.On which planet is one day longer than one year?Mercury
  10. 10.Which planet is less dense than water?Saturn

Where the facts come from

PlanetNASA Planetary Fact Sheet value
MercuryOrbital period 88.0 days; length of day 4,222.6 hours; diameter 3,032 mi (smallest)
VenusMean temperature 464°C / 867°F (highest of the eight)
EarthDensity 5,514 kg/m³ (highest of the eight)
MarsLength of day 24.7 hours; orbital period 687.0 days
JupiterDiameter 142,984 km vs Earth 12,756 km (11.2 times); length of day 9.9 hours (shortest)
SaturnDensity 687 kg/m³; water is 1,000 kg/m³
UranusObliquity to orbit 97.8°
NeptuneDistance from Sun 4,515 million km vs Earth 149.6 (30.2 times)
Rings“Ring system?” is Yes for Jupiter, Saturn, Uranus and Neptune only
Day / YearLength of Day and Orbital Period rows. Hours over 100 divided by 24; days over 1,000 divided by 365.25

Source: NASA Goddard, NSSDCA Planetary Fact Sheet, nssdc.gsfc.nasa.gov/planetary/factsheet (updated March 2025).

Photos: NASA (JPL-Caltech, JHU APL, USGS, Univ. of Arizona, Space Science Institute). Facts: NASA Planetary Fact Sheet.More free worksheets: handeware.com/learn

Version B · 2 pages + answer key · prints on US Letter or A4Customize version B

Science · SpaceAges 8–12 · Grades 3–6

Our Solar System

Eight planets circle the Sun. Read about each one, then try the quiz.

NameDate
1st from the SunMercury, NASA imageNASA/JHUAPL/CIW

Mercury

A year here lasts just 88 Earth days, the shortest of any planet.

Across
3,032 mi
Day
176 Earth days
Year
88 Earth days
Rings
No
2nd from the SunVenus, NASA imageNASA/JPL-Caltech · Mariner 10

Venus

The hottest planet: about 867°F (464°C) on average.

Across
7,521 mi
Day
117 Earth days
Year
225 Earth days
Rings
No
3rd from the SunEarth, NASA imageNASA · Suomi NPP

Earth

Our home is the densest of all eight planets.

Across
7,926 mi
Day
24 hours
Year
365 days
Rings
No
4th from the SunMars, NASA imageNASA/JPL/USGS

Mars

A day on Mars lasts 24.7 hours, close to a day on Earth.

Across
4,221 mi
Day
24.7 hours
Year
687 Earth days
Rings
No
5th from the SunJupiter, NASA imageNASA/JPL/Univ. of Arizona · Cassini

Jupiter

The biggest planet: about 11 Earths would fit across it.

Across
88,846 mi
Day
9.9 hours
Year
about 12 Earth years
Rings
Yes
6th from the SunSaturn, NASA imageNASA/JPL/Space Science Inst.

Saturn

For its size, Saturn is so light it is less dense than water.

Across
74,897 mi
Day
10.7 hours
Year
about 29 Earth years
Rings
Yes
7th from the SunUranus, NASA imageNASA/JPL-Caltech · Voyager 2

Uranus

Tilted about 98°, it spins on its side as it circles the Sun.

Across
31,763 mi
Day
17.2 hours
Year
about 84 Earth years
Rings
Yes
8th from the SunNeptune, NASA imageNASA/JPL · Voyager 2

Neptune

The farthest planet: about 30 times farther from the Sun than Earth.

Across
30,775 mi
Day
16.1 hours
Year
about 164 Earth years
Rings
Yes

Real NASA spacecraft images; NASA processed the colors of some. Not shown to scale. “Day” means sunrise to sunrise.

Quick quiz

  1. 1.Which planet is closest to the Sun?
  2. 2.Venus is not the closest planet to the Sun, but it is the ________ planet.
  3. 3.Which planet spins on its side?
  4. 4.How long is one day on Mars?
  5. 5.Put these in order, starting closest to the Sun: Saturn, Earth, Neptune, Mars.
  6. 6.Which planet is the smallest?
  7. 7.Which planet has the shortest day?
  8. 8.How many of the eight planets have rings?
Photos: NASA (JPL-Caltech, JHU APL, USGS, Univ. of Arizona, Space Science Institute). Facts: NASA Planetary Fact Sheet.More free worksheets: handeware.com/learn
Science · SpaceAges 8–12 · Grades 3–6

Our Solar Systemcontinued

Quick quiz

  1. 9.On which planet is one day longer than one year?
  2. 10.Which planet is less dense than water?
Photos: NASA (JPL-Caltech, JHU APL, USGS, Univ. of Arizona, Space Science Institute). Facts: NASA Planetary Fact Sheet.More free worksheets: handeware.com/learn
Science · SpaceAges 8–12 · Grades 3–6

Our Solar SystemANSWER KEY

Answers to the quick quiz, with the NASA numbers behind every fact on the sheet.

Quiz answers

  1. 1.Which planet is closest to the Sun?Mercury
  2. 2.Venus is not the closest planet to the Sun, but it is the ________ planet.hottest
  3. 3.Which planet spins on its side?Uranus
  4. 4.How long is one day on Mars?24.7 hours
  5. 5.Put these in order, starting closest to the Sun: Saturn, Earth, Neptune, Mars.Earth, Mars, Saturn, Neptune
  6. 6.Which planet is the smallest?Mercury
  7. 7.Which planet has the shortest day?Jupiter
  8. 8.How many of the eight planets have rings?Four: Jupiter, Saturn, Uranus and Neptune
  9. 9.On which planet is one day longer than one year?Mercury
  10. 10.Which planet is less dense than water?Saturn

Where the facts come from

PlanetNASA Planetary Fact Sheet value
MercuryOrbital period 88.0 days; length of day 4,222.6 hours; diameter 3,032 mi (smallest)
VenusMean temperature 464°C / 867°F (highest of the eight)
EarthDensity 5,514 kg/m³ (highest of the eight)
MarsLength of day 24.7 hours; orbital period 687.0 days
JupiterDiameter 142,984 km vs Earth 12,756 km (11.2 times); length of day 9.9 hours (shortest)
SaturnDensity 687 kg/m³; water is 1,000 kg/m³
UranusObliquity to orbit 97.8°
NeptuneDistance from Sun 4,515 million km vs Earth 149.6 (30.2 times)
Rings“Ring system?” is Yes for Jupiter, Saturn, Uranus and Neptune only
Day / YearLength of Day and Orbital Period rows. Hours over 100 divided by 24; days over 1,000 divided by 365.25

Source: NASA Goddard, NSSDCA Planetary Fact Sheet, nssdc.gsfc.nasa.gov/planetary/factsheet (updated March 2025).

Photos: NASA (JPL-Caltech, JHU APL, USGS, Univ. of Arizona, Space Science Institute). Facts: NASA Planetary Fact Sheet.More free worksheets: handeware.com/learn

Version C · 2 pages + answer key · prints on US Letter or A4Customize version C

Science · SpaceAges 8–12 · Grades 3–6

Our Solar System

Eight planets circle the Sun. Read about each one, then try the quiz.

NameDate
1st from the SunMercury, NASA imageNASA/JHUAPL/CIW

Mercury

A year here lasts just 88 Earth days, the shortest of any planet.

Across
3,032 mi
Day
176 Earth days
Year
88 Earth days
Rings
No
2nd from the SunVenus, NASA imageNASA/JPL-Caltech · Mariner 10

Venus

The hottest planet: about 867°F (464°C) on average.

Across
7,521 mi
Day
117 Earth days
Year
225 Earth days
Rings
No
3rd from the SunEarth, NASA imageNASA · Suomi NPP

Earth

Our home is the densest of all eight planets.

Across
7,926 mi
Day
24 hours
Year
365 days
Rings
No
4th from the SunMars, NASA imageNASA/JPL/USGS

Mars

A day on Mars lasts 24.7 hours, close to a day on Earth.

Across
4,221 mi
Day
24.7 hours
Year
687 Earth days
Rings
No
5th from the SunJupiter, NASA imageNASA/JPL/Univ. of Arizona · Cassini

Jupiter

The biggest planet: about 11 Earths would fit across it.

Across
88,846 mi
Day
9.9 hours
Year
about 12 Earth years
Rings
Yes
6th from the SunSaturn, NASA imageNASA/JPL/Space Science Inst.

Saturn

For its size, Saturn is so light it is less dense than water.

Across
74,897 mi
Day
10.7 hours
Year
about 29 Earth years
Rings
Yes
7th from the SunUranus, NASA imageNASA/JPL-Caltech · Voyager 2

Uranus

Tilted about 98°, it spins on its side as it circles the Sun.

Across
31,763 mi
Day
17.2 hours
Year
about 84 Earth years
Rings
Yes
8th from the SunNeptune, NASA imageNASA/JPL · Voyager 2

Neptune

The farthest planet: about 30 times farther from the Sun than Earth.

Across
30,775 mi
Day
16.1 hours
Year
about 164 Earth years
Rings
Yes

Real NASA spacecraft images; NASA processed the colors of some. Not shown to scale. “Day” means sunrise to sunrise.

Quick quiz

  1. 1.Which planet is closest to the Sun?
  2. 2.Which planet is the biggest?
  3. 3.Venus is not the closest planet to the Sun, but it is the ________ planet.
  4. 4.How long is one day on Mars?
  5. 5.Put these in order, starting closest to the Sun: Saturn, Earth, Neptune, Mars.
  6. 6.Which planet is the smallest?
  7. 7.Which planet has the shortest day?
  8. 8.How many of the eight planets have rings?
Photos: NASA (JPL-Caltech, JHU APL, USGS, Univ. of Arizona, Space Science Institute). Facts: NASA Planetary Fact Sheet.More free worksheets: handeware.com/learn
Science · SpaceAges 8–12 · Grades 3–6

Our Solar Systemcontinued

Quick quiz

  1. 9.On which planet is one day longer than one year?
  2. 10.Which planet is less dense than water?
Photos: NASA (JPL-Caltech, JHU APL, USGS, Univ. of Arizona, Space Science Institute). Facts: NASA Planetary Fact Sheet.More free worksheets: handeware.com/learn
Science · SpaceAges 8–12 · Grades 3–6

Our Solar SystemANSWER KEY

Answers to the quick quiz, with the NASA numbers behind every fact on the sheet.

Quiz answers

  1. 1.Which planet is closest to the Sun?Mercury
  2. 2.Which planet is the biggest?Jupiter
  3. 3.Venus is not the closest planet to the Sun, but it is the ________ planet.hottest
  4. 4.How long is one day on Mars?24.7 hours
  5. 5.Put these in order, starting closest to the Sun: Saturn, Earth, Neptune, Mars.Earth, Mars, Saturn, Neptune
  6. 6.Which planet is the smallest?Mercury
  7. 7.Which planet has the shortest day?Jupiter
  8. 8.How many of the eight planets have rings?Four: Jupiter, Saturn, Uranus and Neptune
  9. 9.On which planet is one day longer than one year?Mercury
  10. 10.Which planet is less dense than water?Saturn

Where the facts come from

PlanetNASA Planetary Fact Sheet value
MercuryOrbital period 88.0 days; length of day 4,222.6 hours; diameter 3,032 mi (smallest)
VenusMean temperature 464°C / 867°F (highest of the eight)
EarthDensity 5,514 kg/m³ (highest of the eight)
MarsLength of day 24.7 hours; orbital period 687.0 days
JupiterDiameter 142,984 km vs Earth 12,756 km (11.2 times); length of day 9.9 hours (shortest)
SaturnDensity 687 kg/m³; water is 1,000 kg/m³
UranusObliquity to orbit 97.8°
NeptuneDistance from Sun 4,515 million km vs Earth 149.6 (30.2 times)
Rings“Ring system?” is Yes for Jupiter, Saturn, Uranus and Neptune only
Day / YearLength of Day and Orbital Period rows. Hours over 100 divided by 24; days over 1,000 divided by 365.25

Source: NASA Goddard, NSSDCA Planetary Fact Sheet, nssdc.gsfc.nasa.gov/planetary/factsheet (updated March 2025).

Photos: NASA (JPL-Caltech, JHU APL, USGS, Univ. of Arizona, Space Science Institute). Facts: NASA Planetary Fact Sheet.More free worksheets: handeware.com/learn

How to use it

  1. Read the fact sheet together.
  2. Answer the quiz from the fact sheet.
  3. Check with the answer key.
  4. Pick version B or C for different questions.

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