Universe Test 2025

Surface has wind speeds up to 1,200 miles per hour.

• Neptune

• Mercury

• Venus

• Earth

• Mars

Answer explanation

Neptune is known for its extreme weather, including wind speeds reaching up to 1,200 miles per hour, making it the correct answer. Other planets like Mercury, Venus, Earth, and Mars do not have such high wind speeds.

Tags

NGSS.MS-ESS2-6

If you could stick this planet in a pool of water, it would float.

• Saturn

• Mercury

• Venus

• Earth

• Mars

Answer explanation

Saturn is the only planet in our solar system that is less dense than water, meaning it would float if placed in a pool. The other planets, including Mercury, Venus, Earth, and Mars, are denser than water.

This planet rotates on its side. The axis is horizontal instead of vertical.

• Uranus

• Mercury

• Venus

• Earth

• Mars

Answer explanation

Uranus is unique among planets as it rotates on its side, with its axis tilted approximately 98 degrees from the vertical. This horizontal rotation distinguishes it from other planets like Mercury, Venus, Earth, and Mars.

As the iron core of the planet cooled and contracted, the surface of the planet became “wrinkled”. This gave the planet tall cliffs.

• Mercury

• Venus

• Earth

• Mars

• Jupiter

Answer explanation

Mercury's surface features, including tall cliffs, are a result of the planet's cooling iron core causing contraction and wrinkling. This geological process is unique to Mercury among the options provided.

The Great Red Spot is a hurricane on this planet's surface. Scientists believe that this storm has been around for at least 350 years.

• Jupiter

• Mercury

• Venus

• Earth

• Mars

Answer explanation

The Great Red Spot is a massive storm located on Jupiter, known for its longevity, having existed for at least 350 years. This distinguishes it from other planets listed, making Jupiter the correct answer.

Scientists believe that the surface of this planet is recycled every so many millions of years. They know this because the surface does not have many craters on it from meteor impacts.

• Venus

• Mercury

• Earth

• Mars

• Jupiter

Answer explanation

Scientists believe Venus has a young surface due to its lack of craters, indicating that the surface is recycled every few million years, unlike Mercury or Mars, which show more impact craters.

Tags

NGSS.MS-ESS2-1

The largest mountain/volcano of the solar system lives on this planet. This is called Olympus Mons

• Mars

• Mercury

• Venus

• Earth

• Jupiter

Answer explanation

Olympus Mons, the largest volcano in the solar system, is located on Mars. It stands about 13.6 miles (22 kilometers) high, making it significantly taller than any mountain on Earth.

Tags

NGSS.MS-ESS1-3

It is said that this planet is apart of the “Goldilocks Zone” – Not too hot and not too cold, just the right temperature for life to exist!

• Earth

• Mercury

• Venus

• Mars

• Jupiter

Answer explanation

Earth is located in the "Goldilocks Zone," where temperatures are just right for liquid water and life to exist. Mercury and Venus are too hot, while Mars is too cold, making Earth the only suitable option.

Which planets are considered terrestrial planets? Check all that apply to receive credit for this question.

• Mercury

• Venus

• Earth

• Mars

• Jupiter

Answer explanation

Terrestrial planets are rocky and include Mercury, Venus, Earth, and Mars. Jupiter is a gas giant, not a terrestrial planet.

Which planets are considered gas/ice giants? Check all that apply to receive credit for this question.

• Jupiter

• Saturn

• Uranus

• Neptune

• Mercury

Answer explanation

Jupiter and Saturn are gas giants, while Uranus and Neptune are classified as ice giants. Mercury is a terrestrial planet and does not belong to either category.