Periodic table of the elements
All 118 elements. Click an element for details, or a category to highlight it.
Standard atomic weights (IUPAC), rounded; values in brackets are the mass number of the most stable isotope.
The planets of the Solar System
Relative sizes to scale. Click a planet to highlight it in the table.
| Planet | Diameter, km | Distance from Sun, AU | Orbital period, days | Known moons |
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Source: NASA Planetary Fact Sheet. Moon counts as of 2024.
Highest mountains and longest rivers
The fourteen eight-thousanders and the world's longest rivers.
Eight-thousanders, m
Longest rivers, km
River lengths vary between sources depending on how the source is defined.