Mercury - The Swift Planet
The Space Explorers
Mercury Mission Headquarters
Welcome, Explorer.
Mercury may be the smallest planet in our Solar System, but it is filled with enormous temperature changes, ancient craters, and surprising discoveries. Explore each mission below to learn how Mercury moves, what lies beneath its rocky surface, and how spacecraft have helped scientists uncover its secrets.
Meet Mercury
Discover the smallest planet in our Solar System.
Mercury is the closest planet to the Sun, but it isn't the hottest. This rocky world is covered with ancient craters, has a gigantic iron core, and experiences some of the most extreme temperatures in our Solar System.
🌟 Why It Matters
Studying Mercury helps scientists understand how rocky planets formed, why some planets have magnetic fields, and what our Solar System looked like billions of years ago.
🚀 Explorer Challenge
Watch the video below. Can you discover three surprising facts about Mercury before it ends?
Explore the Planet of Extremes
Watch our active star change.
Mercury may be small, but it is a planet of incredible extremes. Discover why its days are scorching hot, its nights are freezing cold, and why time works differently here than anywhere else in our Solar System.
🌟 Why It Matters
Mercury teaches scientists how planets can survive in harsh environments and helps us understand how rocky planets formed billions of years ago.
🚀 Explorer Challenge
Review the information below, what extremes stood out to you?
Mercury Missions
Meet the Explorers of Mercury
Mercury is the smallest planet in our Solar System and one of the hardest worlds to explore. As it travels so close to the Sun, spacecraft must survive intense heat and carefully use gravity to reach it. Although only a few missions have visited Mercury, each one has transformed what we know about this remarkable planet.
🌟 Why It Matters
Every mission has uncovered new clues about Mercury's ancient surface, giant iron core, magnetic field, and mysterious polar ice. Together, these discoveries help scientists better understand how the rocky planets in our Solar System formed.
🚀 Explorer Challenge
Each spacecraft has a different mission. As you explore, see if you can discover:
- Which spacecraft was the first to visit Mercury.
- Which spacecraft became the first to orbit Mercury.
- Which spacecraft is still on its journey to Mercury.
- Which mission discovered water ice hidden inside permanently shadowed craters.
Can you figure out why scientists continue sending new missions to Mercury?
Mariner 10
The First Visitor
Mariner 10 became the first spacecraft to visit Mercury in 1974. During three flybys, it captured the first close-up photographs of the planet and made discoveries that changed how scientists understood Mercury.
Mission Snapshot
- Launch Date: November 3, 1973
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Agency: NASA
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Mission Type: Flyby
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Mercury Flybys: Three (1974–1975)
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Status: Mission Complete
🌟 Why This Mission Matters
Before Mariner 10, Mercury was one of the least understood planets in our Solar System. Its flybys revealed a heavily cratered surface, discovered that Mercury has a magnetic field, and gave scientists their very first close-up look at the planet.
Parker Solar Probe
Touching the Sun Like Never Before
Discover how NASA's Parker Solar Probe flies closer to the Sun than any spacecraft in history to unlock the secrets of our nearest star.
Mission Snapshot
- Launch Date: August 12, 2018
- Agency: NASA
- Spacecraft: Parker Solar Probe
- Mission Goal: Fly through the Sun's outer atmosphere to learn how the Sun works.
- Status: Active
🌟 Why This Mission Matters
Parker Solar Probe is helping scientists answer questions that have puzzled people for decades. By flying closer to the Sun than any spacecraft before it, it collects information that helps us understand solar storms, protect astronauts and satellites, and learn more about the star that makes life on Earth possible.
Solar Orbiter
Exploring the Sun from Every Angle
Discover how Solar Orbiter captures incredible images of the Sun while studying how our nearest star affects the entire Solar System.
Mission Snapshot
- Launch Date: February 10, 2020
- Agency: European Space Agency (ESA) & NASA
- Mission Goal: Study the Sun up close and take the first detailed images of its poles.
- Closest Approach: About 26 million miles (42 million km) from the Sun.
- Status: Active
🌟 Why This Mission Matters
Solar Orbiter helps scientists understand how the Sun works by studying areas we've never seen before, including its north and south poles. What it discovers helps us learn more about space weather and how the Sun influences every planet in our Solar System.
Solar Dynamics Observatory (SDO)
Watching the Sun Every Day
Discover how NASA's Solar Dynamics Observatory keeps a constant watch on our nearest star, capturing amazing images and helping scientists understand how the Sun changes over time.
Mission Snapshot
- Launch Date: February 11, 2010
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Agency: NASA
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Mission Goal: Observe the Sun continuously and study its activity.
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Special Feature: Captures high-resolution images of the Sun every day.
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Status: Active
🌟 Why This Mission Matters
The Sun is always changing. SDO helps scientists watch solar flares, sunspots, and other activity as it happens. These observations improve our understanding of the Sun and help scientists predict space weather that can affect Earth.
Beyond Our Sun
Our Star Is Just the Beginning.
The Sun is one of billions of stars in our galaxy, and billions more exist throughout the universe. Some stars are tiny and cool, while others are so enormous they could swallow our entire Solar System. As you continue your mission, discover how our Sun compares to other incredible stars and explore the amazing variety found across space.
🌟 Why It Matters
Space Explorers don't just learn about our Sun, they discover how it fits into the much bigger universe. Comparing stars helps scientists understand how stars form, how they change, and why our Sun has been able to support life on Earth for billions of years.
🚀 Explorer Challenge
Can you discover:
- ⭐ Which star is closest to our Sun?
- 🔴 Which star is the largest?
- 🔵 Which star is the hottest?
- ☀️ What type of star is our Sun?
What makes our Sun special, even though it isn't the biggest or brightest star?
Games and More
Your Mission Continues.
You've learned about our nearest star. Now it's time to test your knowledge, complete challenges, and see if you can earn your Space Explorer badge.
🚀 Explorer Challenge
- Play the Kahoot game
- Practice Sun Vocabulary
- Which star is the hottest?
What makes our Sun special, even though it isn't the biggest or brightest star?
Ready for the Full Mission?
Want to dive deeper into the Sun?
The complete Sun unit includes printable missions, STEM activities, critical thinking, Kahoots, certificates, and much more.
This standards-aligned, mission-based unit helps young explorers learn all about our closest star through engaging activities, hands-on investigation, and real-world connections.
Inside you'll find...
✔ 6 Reading Lessons
✔ Science Logs
✔ STEM Challenges
✔ Vocabulary
✔ Final Kahoot
✔ Explorer Certificate
This printable unit is the perfect way to dive deeper into the Sun and build a strong foundation in Earth and Space science. It is great for classrooms, homeschool, co-ops, and other educational settings.
Parents will appreciate the flexibility, teachers will use it year after year, and kids will enjoy learning on their mission!
