Sunday 28th April 2024

    Planets IV (Quiz #527)

    Photo by <a href="https://unsplash.com/@nasa?utm_content=creditCopyText&utm_medium=referral&utm_source=unsplash">NASA</a>
    Photo by NASA (Unsplash)

    1. Which planet has the most moons (confirmed + provisional)?

    2. How many spacecraft have visited Uranus (i.e. passed close enough to make detailed observations)?

    3. No probe has ever soft-landed on Mercury. How many of the following factors make it very difficult to do this?
    - Mercury orbits the Sun very quickly
    - Mercury's thick, acidic atmosphere is extremely corrosive
    - Mercury's close proximity to the Sun means that spacecraft are accelerated by the Sun's gravitational pull

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