All 8 facts in this deck
Prefer to read them all at once? Here they are, each with its source.
Can you see the Great Wall of China from the Moon?
You can't see the Great Wall of China from the Moon. It's a famous claim, but it isn't true. The wall is long but narrow, and roughly the same color as the land around it. NASA notes it can't be seen from the Moon, and even from low Earth orbit it is hard or impossible to spot without powerful camera lenses.
Takeaway: Long isn't the same as visible: width and contrast matter from far away.
Source: Great Wall — NASA, checked 2026-10-21.
What causes the seasons on Earth?
Seasons come from Earth's tilt, not its distance from the Sun. Many people assume summer happens when Earth is closest to the Sun. In fact, Earth's axis is tilted, so each hemisphere takes turns leaning toward the Sun and getting more direct light. The proof: Earth is nearest the Sun in early January, in the middle of northern winter.
Takeaway: Earth is closest to the Sun in early January, during northern winter.
Source: What Causes the Seasons? — NASA Space Place, checked 2026-10-21.
Is there a dark side of the Moon?
The Moon's far side gets as much sunlight as the near side. There is no permanently "dark side" of the Moon. Because the Moon spins once per orbit, we always see the same face, but the hidden far side has day and night like anywhere else. During a new moon, when our side looks dark, the far side is fully lit.
Takeaway: "Far side" is the accurate term; "dark side" is just a nickname.
Source: Top Moon Questions — NASA Science, checked 2026-10-21.
Why do astronauts float in space?
Astronauts float because they're falling, not because gravity vanished. At the International Space Station's height, Earth's gravity is still about 90 percent as strong as on the ground. Astronauts float because the station and everyone in it are constantly falling toward Earth while moving sideways so fast that they keep missing it. That endless fall feels like weightlessness.
Takeaway: Orbiting is just falling around the planet fast enough to keep missing it.
Source: What Is Microgravity? (Grades 5-8) — NASA, checked 2026-10-21.
Is a day on Venus longer than a year?
Venus takes longer to spin once than to go around the Sun. Venus turns extremely slowly: one full spin on its axis takes 243 Earth days, while one trip around the Sun takes only about 225. It also spins in the opposite direction to most planets, so on Venus the Sun would rise in the west and set in the east.
Takeaway: On Venus, one rotation lasts longer than a whole year.
Source: Venus: Facts — NASA Science, checked 2026-10-21.
Would Saturn float in water?
Saturn is less dense than water. Saturn is huge, but it is made mostly of hydrogen and helium, the two lightest elements. Its average density is lower than water's, the only planet in our solar system where that is true. In theory, if you could find a bathtub big enough, Saturn would float in it.
Takeaway: Big doesn't mean heavy for its size: Saturn is mostly light gas.
Source: Saturn: Facts — NASA Science, checked 2026-10-21.
Is Mauna Kea taller than Mount Everest?
Measured from base to peak, Mauna Kea is taller than Everest. Mauna Kea in Hawaii rises about 4,200 m (13,800 ft) above sea level, but most of the volcano is hidden underwater, reaching down about 6,000 m to the ocean floor. Measured from its base it is about 10,200 m (33,500 ft) tall, well over Mount Everest's 8,849 m above sea level.
Takeaway: "Tallest mountain" depends on whether you measure from sea level or the base.
Source: How big are the Hawaiian volcanoes? — U.S. Geological Survey, checked 2026-10-21.
What is the longest mountain range on Earth?
Earth's longest mountain range is almost entirely underwater. The mid-ocean ridge is a chain of undersea volcanic mountains that winds around the globe like the seam on a tennis ball. It stretches nearly 65,000 kilometres, and more than 90 percent of it lies deep in the ocean. It forms where tectonic plates pull apart and new seafloor is made.
Takeaway: The planet's biggest mountain range is one almost nobody has ever seen.
Source: What is a mid-ocean ridge? — NOAA Ocean Exploration, checked 2026-10-21.