A Space Daily column

Life Signs

Nature and earth science

Life Signs is where Space Daily looks down instead of up. Animals, ecosystems, and Earth science, with a bias for peer-reviewed studies over press-release hype. The living world turns out to be at least as strange as anything in orbit.

Solar Science

A grain of stardust extracted from the Murchison meteorite that landed in Victoria in 1969 was dated to roughly 7 billion years old, meaning it condensed in the atmosphere of a dying star more than 2 billion years before the Sun existed

A silicon carbide grain extracted from the Murchison meteorite, which fell on a Victorian dairy farm in 1969, was dated in 2020 to about seven billion years old — condensed in the atmosphere of a dying star more than two billion years before the Sun existed, and the oldest solid material ever held in a human hand.

Aug 10, 2026

Science

Saudi Arabia sits on the world’s largest sand desert and yet imports construction sand from Australia, because the wind-rounded grains of the Empty Quarter are too smooth to bind in concrete and modern construction needs the jagged sand pulled from riverbeds and quarries

Saudi Arabia sits on the largest continuous sand sea on Earth and still imports construction sand from Australia and Scotland, because thousands of years of wind erosion have polished its desert grains too smooth to bind with cement. The paradox of a country shipping in the material beneath its own feet is now a fixture of every Gulf megaproject.

Aug 9, 2026

Science

The Greenland shark grows about one centimetre per year and does not reach sexual maturity until roughly age 150, meaning the pups being born in the North Atlantic this year will not breed until the 22nd century

The Greenland shark grows about a centimetre a year and does not reach sexual maturity until around 150, meaning pups born in the North Atlantic this year will not breed until the 22nd century.

Aug 9, 2026

Science

In 1994, a bushwalker rappelling into a sandstone canyon 150 kilometres from Sydney found a stand of trees with waxy bubbled bark that matched fossils 90 million years old, and the Wollemi pine turned out to be a species everyone had assumed died with the dinosaurs

In 1994, a New South Wales parks officer abseiled into a Blue Mountains canyon and found a stand of trees whose species was only known from 90-million-year-old fossils. Fewer than 100 wild Wollemi pines still exist, in a grove whose coordinates the Australian government keeps classified.

Aug 9, 2026

Science

A jar of honey sealed inside an Egyptian tomb around 1000 BCE was opened by archaeologists in the 20th century and found still edible, preserved by its own low water content, natural hydrogen peroxide, and a pH acidic enough that no known bacterium can grow in it

Sealed honey from ancient Egyptian burial contexts is reported to remain edible after millennia — a claim whose specific instances are hard to source, but whose underlying chemistry, driven by low water content, acidic pH and bee-made hydrogen peroxide, is real and well-documented.

Aug 8, 2026

Science

A tiny freshwater hydra shows no measurable signs of aging, and when Daniel Martinez tracked three cohorts of them at Pomona College for four years the death rate never rose once — over that same stretch each animal had quietly replaced its entire body, cell by cell, at least 60 times

The freshwater polyp Hydra vulgaris shows no measurable signs of aging in laboratory colonies, and researchers have watched single animals regenerate from pinhead-sized fragments more than sixty times without cellular decline. A 2021 paper in Genome Biology and Evolution mapped how it does it.

Aug 5, 2026

Science

A single Nile crocodile bite closes with roughly 3,700 pounds of force per square inch, more than any measured living animal, yet the muscles that open the same jaw are so weak an adult can hold them shut with two hands

A Nile crocodile's bite closes with about 3,700 PSI — the strongest bite force ever measured in a living animal — yet the muscles that open the same jaw are so weak an adult can hold them shut by hand. That asymmetry is 100 million years of evolutionary logic.

Aug 3, 2026

Flora And Fauna

Elephants appear to call each other by name: a 2024 study found they summon particular herd-mates with specific, invented rumbles — and an elephant reacts when it hears the call meant for it, but not the ones meant for others

The discovery challenges what we thought we knew about animal communication and raises unsettling questions about consciousness in creatures we've long underestimated.

Jul 24, 2026

Space Travel

How did a captured German rocket, launched from a New Mexico desert in 1946, produce the first photograph of Earth from space using a 35mm camera bolted into its nose cone?

The first photograph of Earth from space wasn't taken by an astronaut or a satellite, but by a camera strapped to a weapon of war, surviving the very machine that carried it skyward.

Jul 23, 2026

Flora And Fauna

Scientists recorded more than 50 days of deep-ocean footage before a goblin shark appeared for just over 20 seconds near the Tonga Trench, one of the first two confirmed sightings of this 125-million-year lineage alive in its natural habitat

A creature so rare that scientists had to film the ocean floor for weeks just to glimpse it for 20 seconds—and what they saw rewrote everything we thought we knew about where it lives.

Jul 23, 2026

Flora And Fauna

Wood frogs freeze solid every winter — up to 65% of their body water turns to ice and their heart stops completely — yet they thaw out in spring and hop away as if nothing happened

Scientists still don't understand how wood frogs survive what should be an unsurvivable state—or what lessons their biology might hold for preserving human organs.

Jul 23, 2026

Climate Science

Tropical trees are dying faster than they ever have on record, and the culprit scientists identified in a 2025 study isn’t heat or drought — it’s ordinary thunderstorms, now fiercer with climate change, responsible for up to 60% of tree deaths in some regions

Tropical forests face a hidden killer: the ordinary thunderstorm is becoming extraordinary, and scientists may have drastically underestimated how much damage it now inflicts.

Jul 23, 2026

Climate Science

We tend to think of the deep ocean as dark and silent, but NOAA research found that 80 percent of animals living between 200 and 1,000 metres depth produce their own light — meaning bioluminescence, not sunlight, is likely the most common form of communication on the planet

Most communication on Earth happens in the dark, in a language we're only beginning to understand.

Jul 23, 2026

Climate Science

How does a rodent that weighs 20 kilos and builds mud walls raise a valley’s water table by nearly a metre and store more carbon in the wet ground than the trees above it?

How beaver dams — built by a 20-kilo rodent using teeth and mud — raise valley water tables by close to a metre and turn the soil beneath the forest into a carbon store that outperforms the trees above it.

Jul 22, 2026

Earth News

Elephants in Mozambique’s Gorongosa Park are being born tuskless at rates approaching 33% — a genetic signature of 15 years of civil-war ivory hunting that the population is now passing to its daughters

Fifteen years of ivory hunting during Mozambique's civil war left a genetic mark on Gorongosa's elephants that is still visible in their daughters' skulls today — roughly a third of females now born without tusks, a Princeton team traced to two specific genes.

Jul 22, 2026

Water World

The largest waterfall on Earth is hidden beneath the ocean between Greenland and Iceland, where cold water plunges more than three kilometres down the seafloor at 3.5 million cubic metres per second

The ocean's most powerful waterfall moves in silence, invisible to satellites and hidden beneath one of the planet's most turbulent seas.

Jul 22, 2026