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nepheline syenite
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nepheline syenite
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Basalt sample returned by Apollo 15, from near a long sinous lunar valley called Hadley Rille. Measured at 3.3 years old.
(Bed) Rocks and (Flint) Stones
Read Next
solar eclipse, sun, moon, astronomy, space
How Do You Tell the Difference Between Total, Annular, Solar, and Lunar Eclipses?
Arrangement of the phases of the moon in total eclipse with Blood Moon
9 Celestial Omens
Solar system illustration. (planets; sun)
Why Are Planets Round?
Arenal Volcano in northwestern Costa Rica in the province of Alajuela.
Are Volcanoes Dangerous When They’re Not Erupting?
Galaxy clusters like Abell 2744 can act as a natural cosmic lens, magnifying light from more distant, background objects through gravity. NASA's James Webb Space Telescope may be able to detect light from the first stars in the universe if they are gravitationally lensed by such clusters. (astronomy, space exploration, galaxies)
How Fast Is the Universe Expanding?
Discover
Drinking water is poured into a glass.
Water Fluoridation: Just the Facts
Illustration for Demystified "How Dangerous is Quicksand"
How Deadly Is Quicksand?
Berries and leaves of the bittersweet nightshade (Solanum dulcamara) plant. Poisonous plant
7 of the World’s Deadliest Plants
Aurochs. Bos primigenius. Skeleton. Extinct animal. Skeleton of an Aurochs, an extinct wild ox.
6 Animals We Ate Into Extinction
Figure 13: A Maxim machine gun, belt-fed and water-cooled, operated by German infantrymen, World War I.
7 Deadliest Weapons in History
King Cobra snake in Malaysia. (reptile)
9 of the World’s Deadliest Snakes
Periodical Cicada, Adult, Magicicada spp. Requires 17 years to complete development. Nymph splits its skin, and transforms into an adult. Feeds on sap of tree roots. Northern Illinois Brood. This brood is the largest emergence of cicadas anywhere
Why Do Some Cicadas Appear Only Every 17 Years?

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Basalt sample returned by Apollo 15, from near a long sinous lunar valley called Hadley Rille. Measured at 3.3 years old.
(Bed) Rocks and (Flint) Stones