Which extremely high-altitude clouds glow in the dark near the polar regions during summer nights?
Tap your pick
Noctilucent clouds are the highest clouds in Earth's atmosphere, forming in the mesosphere about fifty miles up. They are composed of tiny ice crystals that catch the sunlight long after the sun has set on the ground. Scientists believe they are becoming more visible due to increased methane emissions. Photo: Matthias Süßen, Wikimedia Commons, CC BY-SA 4.0.
Read more on Wikipedia
Source: Wikipedia (CC BY-SA)
Not the question you came for?
Ask your own!
In your own words. No account, 20 seconds.
Photo Duos, quizzes and more? That's in the free app.
That didn't work. Check the fields and try again.
Your Duo is live! 🎉
Your link is how votes come in: share it with everyone who should weigh in.
Would your friends get this right?
Send it to your group chat — see who knows.
</>Embed on your site
Put this Duo on your own site
Paste the code into your page. The player fits itself in, and every vote counts in Votur.
On WordPress, Ghost or Squarespace? Just paste the link of this page into your post.
This is how it looks
More like this
- How long is the memory of a goldfish?
- How much of our brain do we use?
- Can the Great Wall of China be seen with the naked eye from space?
- Can a coin dropped from a skyscraper kill someone?
- Are bats blind?
- Do diamonds originate from coal?
- Which fabric is made from the flax plant?
- Which substance gives skin its brown color when tanning?
- Which hardwood is actually the softest in the world?
- Which animal can jump the highest relative to its body size?
- Why do cats see well in the dark?
- Which planet is closest to the sun?
- Which river is often considered the longest in the world?
- Who developed the theory of relativity?
Come join us on Votur!
Voting is fun! But the real fun begins when you start asking and sharing.
Vote on taste Duos, play quick quizzes, or make your own — private for friends or public for the world. From now on, you'll always have something to talk about!
Vote on 7,242+ questions like this in the free Votur app →
