As of today, new standard defines the kilogram. (Credit: Shutterstock/Piotr Wytrazek)
We measure stuff all the time – how long, how heavy, how hot, and so on – because we need to for things such as trade, health and knowledge. But making sure our measurements compare apples with apples has been a challenge: how to know if my kilogram weight or meter length is the same as yours.
Attempts have been made to define the units of measurement over the years. But today – Interna ...read more
Pluto’s Sputnik Planitia may be insulating its underground ocean. (Credit: NASA/JHU-APL/SwRI)
Pluto has left astronomers puzzled ever since the world was discovered in 1930. And its mysteries only grew in the aftermath of NASA’s New Horizons probe, which cruised by the dwarf planet in 2015. One point of confusion is Sputnik Planitia, part of the now-familiar heart-shaped region on Pluto’s northern hemisphere.
New Horizons' instruments hinted that there might be an underg ...read more
From Doggerland to Beringia, the sea took some of prehistory’s most important archaeological sites. All over the world, scientists are beginning to find them again. ...read more
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The year is 1994, the country is South Africa, and the scene, which was movingly described by Alon Paton, in his book Cry the Beloved Country was as follows: “ In the hilly South Afr ...read more
A cosmic hit-and-run some 30 million light-years away has left one galaxy with an identity crisis.
For billions of years, the now-irregular NGC 4485 lived a nice and normal life as a standard spiral galaxy located in the constellation Canes Venatici (the Hunting Dogs). Then, a few million years back, NGC 4485 experienced a near-miss when the equivalent of a galactic semi-truck (NGC 4490) careened past it, creating a gravitational wake that wreaked havoc for both parties.
The ...read more
