There are 64 records in the database
(20 in this table).
You may up- or downvote records to gauge their relevance.
You may up- or downvote records to gauge their relevance.
| Type ▲ ▼ | Description ▲ ▼ | Value | Importance ▲ ▼ |
|---|---|---|---|
| Speed of light | 300 000 kilometers per second | ||
| Earth's age | 4.6 billion years | ||
| Extinction of the dinosaurs | 66 million years ago | ||
| Absolute zero | − 273 degree celsius | ||
| Number of naturally occuring elements | 98 | ||
| Pi | 3.141 59... | ||
| Speed of sound in air | ~ 340 meters per second | ||
| Age of the universe | 13.8 billion years | ||
| Time it takes light to travel from Sun to Earth | 8 minutes | ||
| Earth's axial tilt | 23 degree | ||
| Information stored in the human genome | ~ 700 megabytes | ||
| Earliest life on earth | 3.5 billion years ago | ||
| Radius of the earth | ~ 6 400 kilometers | ||
| Wavelength of visible light (blue-red) | 400 - 700 nanometers | ||
| Estimated number of stars in the Milky Way | 200 - 400 billion | ||
| Height of Mount Everest | 8 848 meters | ||
| Euler's number | 2.718 28... | ||
| Period of the moon's orbit | 29.5 days | ||
| Size of an atom | 10-10 meters | ||
| Surface temperature of the Sun | ~ 5 500 degree celsius |
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Not just any numbers: It provides a topically broad list thereof – worth to be memorized, not just as part of general knowledge, but as a benchmark to gauge the world we live in.
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For more background information click here.
Not just any numbers: It provides a topically broad list thereof – worth to be memorized, not just as part of general knowledge, but as a benchmark to gauge the world we live in.
These numbers can either be explored one after another in a quiz-like fashion, or accessed in an aggregated, tabular form. In addition, there is a simple voting mechanism that allows visitors to up- and downvote records to rate their importance.
The purpose of numbers2know.org is not to provide a comprehensive list to look up numbers, but to encourage and support people memorizing selected numerical values of general interest.
For more background information click here.
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