Mercury is the smallest planet in the Solar System and the one with the smallest average distance from the Sun. It is a rocky world of cratered terrain, extreme temperature swings, and unusually long days. Here are the key facts—and the answers to common questions about its orbit, ice, moons, and exploration.
What is Mercury?
Mercury is the innermost of the Solar System’s eight planets. Its radius is about 2,440 km (1,516 miles), making it slightly larger than Earth’s Moon and a little more than one-third Earth’s width. NASA estimates it formed about 4.5 billion years ago.
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Its surface is heavily cratered, much like the Moon’s. The Caloris Basin, one of its largest impact features, is about 1,550 km (960 miles) across. Long cliffs called scarps cross parts of the planet; they formed as Mercury’s interior cooled and the planet contracted.
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Mercury’s average distance from the Sun is about 58 million km (36 million miles), or 0.4 astronomical units. Its orbit is elliptical rather than circular, so the distance varies: Mercury comes as close as about 47 million km (29 million miles) and moves as far as about 70 million km (43 million miles) from the Sun. “Closest planet” refers to its average distance.
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How long is a day on Mercury?
The answer depends on what “day” means. Mercury rotates once on its axis in about 59 Earth days, but it takes 176 Earth days for the Sun to return to the same place in the sky—for example, from one sunrise to the next at a given location.
| Measure | Mercury’s period | What it describes |
|---|---|---|
| Year | 88 Earth days | One orbit around the Sun |
| Rotation | About 59 Earth days | One turn on its axis |
| Solar day | 176 Earth days | One sunrise-to-sunrise cycle |
Mercury’s slow rotation and rapid orbit create an unusual apparent motion of the Sun in some places: after rising, it can briefly set and then rise again.
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- Realistic View of the Swiftest Planet - A scientifically accurate depiction of Mercury, complete with cratered ridges and textured terrain — a tribute to the planet closest to the Sun.
- Solar-Powered Rotation – No Batteries or Wires - Utilizes ambient light and magnetic torque to rotate quietly and continuously. A seamless blend of movement and modern space education.
- Larger Display - Designed to draw focus in room settings like executive offices, museum shelves, or astronomy-themed decor.
- Premium Build with Seamless Movement - A fluid-suspended inner globe rotates within a clear acrylic outer shell, offering a smooth, almost magical visual experience.
- Gift for the Curious and the Cosmic - Great for astronomy lovers, educators, space fans, and collectors of planetary objects. A beautiful, kinetic sculpture that sparks curiosity.
Is Mercury the hottest planet?
No. Mercury can reach about 430°C (800°F) in daytime, but its nighttime surface can fall to about −180°C (−290°F). It has only a thin exosphere, not a substantial atmosphere that can retain heat and spread it around the planet.
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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsVenus is the hottest planet. NASA gives Venus a mean surface temperature of 464°C (867°F); its dense atmosphere traps heat, keeping the planet hotter overall than Mercury.
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- BUILD & DISPLAY A MOVING, GLOWING SOLAR SYSTEM – With this kit, kids can customize all 8 planets and the sun, creating a stunning 3D solar system model that glows in the dark! It’s an awesome addition to any space-themed room.
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What is Mercury made of?
Mercury has a large metallic core with a radius of about 2,074 km (1,289 miles)—roughly 85% of the planet’s radius. NASA says evidence indicates that part of the core is molten or liquid. The outer shell, consisting of mantle and crust, is about 400 km (250 miles) thick.
The planet’s magnetic field at the surface is about 1% as strong as Earth’s and interacts with the solar wind. Its exosphere is extremely thin; NASA lists oxygen, sodium, hydrogen, helium, and potassium among its main constituents.
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- More Than Just A Fidget Toy - The solar system stress balls are fun to play around with. They aren't just squeeze balls for kids. They could also be used to set up as a 3D solar system model to provide an interesting & easy way for children to learn & understand our Universe & space science
- Fun Space Toys For Kids 3-5 - The Sun, Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto & Moon balls. A set of 11 solar system balls, wall stickers & 12 educational flashcards that comes in a gift box for easy storage
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Is there ice on Mercury?
Water ice may exist in deep craters near both poles, but the possibility applies to permanently shadowed regions. These locations receive little or no direct sunlight, unlike most of Mercury’s surface. The evidence does not mean the planet is broadly covered in ice.
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No. NASA lists Mercury as having no known moons and no rings. Its axial tilt is about 2 degrees relative to its orbital plane, so the planet stays nearly upright as it orbits and does not have seasons in the way many planets do.
Could life exist on Mercury?
Mercury’s environment is not considered conducive to life as we know it. Its surface experiences extreme temperatures and intense solar radiation. This is a statement about known conditions, not a claim that every possibility has been tested.
How have spacecraft explored Mercury?
NASA’s Mariner 10 was the first spacecraft to visit Mercury. MESSENGER later flew past the planet three times, then orbited it for four years before its mission ended when it crashed into Mercury in April 2015. The joint European-Japanese BepiColombo spacecraft made its first Mercury flyby in October 2021; that milestone alone does not establish its current operational status or arrival schedule.
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