At a Glance
- Hope is a United Arab Emirates mission to study Mars’ climate. Launched in July 2020 and arriving in February 2021, it is the Arab world’s first mission to another planet.
- By studying Mars’ current climate, Hope will help scientists understand what ancient Mars was like, when liquid water on the surface could have supported life.
- You can support the exploration of Mars and missions like Hope simply by sharing the passion, beauty, and joy of space.
Why do we need Hope?
Mars is a cold, dry, desert, with a carbon dioxide-filled atmosphere 100 times thinner than Earth’s. But it wasn’t always like that. We know liquid water once flowed on its surface, supported by an atmosphere that may have been favorable to life.
But then something happened. About 4 billion years ago—right around the time life arose on Earth—Mars lost its magnetic field. On Earth, our magnetic field shields us from the solar wind, the constant stream of charged particles coming from the Sun. Without a magnetic field for protection, the solar wind stripped away much of Mars’ atmosphere, eventually transforming the planet into its current state. This discovery was made by NASA’s MAVEN spacecraft, which continues to study the planet.
Hope will build on MAVEN’s findings by building a complete picture of the Martian atmosphere, and studying how Mars’ climate changes over time. This will give scientists deeper insight into how Mars changed over time, and whether the planet could have once supported life. It will also help us understand how our own planet’s climate is changing, and what the consequences of those changes are.
Hope also demonstrates the importance of international collaboration in space exploration. The mission is managed by the United Arab Emirates (UAE), with participation from scientists and engineers at U.S. universities. Japan will launch the spacecraft. Space exploration brings us all together, and when more nations participate and collaborate, everyone wins.
How Hope will explore Mars
Hope's orbit around Mars will be roughly 22,000 by 44,000 kilometers—much higher than NASA’s MAVEN, which has a tight, 4,500-by-150-kilometer orbit optimized for relaying communications between rovers on the surface and Earth.
From its high perch, Hope will study Mars’ upper atmosphere, watching traces of hydrogen and oxygen—remnants from Mars’ wetter days—leak into space. The spacecraft will also study how the planet’s upper and lower atmospheres interact with each other, while a high-resolution digital camera will capture stunning views of the planet.
Hope’s primary science mission is scheduled to last for 2 years. The mission could be extended for another 2 years after that.
Humans can’t see ultraviolet light, but some animals can, possibly including dogs and cats. Mars has daytime ultraviolet aurora, caused by solar wind hitting hydrogen molecules leaking into space. That means if you brought your dog or cat to Mars, it might be able to see direct evidence of Mars’ atmosphere leaking into space!
What you can do to support Hope
You can help us support the exploration of Mars and other worlds by sharing the passion, beauty, and joy of space exploration. Visit our Mars page to learn about The Planetary Society’s top priorities for Mars exploration.
Three ways you can be a space advocate
- Sign up for The Downlink, our weekly toolkit that contains news, announcements, and actions you can take to support space science and exploration.
- Take our Space Advocacy 101 course to learn the inner works of NASA, how Congress develops space legislation, and how to engage with your elected officials.
- Share this page with a friend, spread the word on social media, and tell others about the importance of knowing the cosmos and our place within it.
You can also follow the mission directly:
This page was written by Planetary Society staff writers based on research provided by Andrew Jones. It is regularly updated.