British theoretical physicist and cosmologist, Professor Stephen Hawking in 2014. EPA/Andy Rain

Tributes pour in for Stephen Hawking, the famous theoretical physicist who died at age 76

Stephen Hawking inspired people with his work on black holes and other mysteries of the universe. Many were quick to pay tribute to the theoretical physicist who died today in the UK, aged 76.
Without satellites, modern technologies such mobiles phones and GPS would not exist. Flickr/NASA Goddard Space Flight Center

Curious Kids: How do satellites get back to Earth?

We’ve all seen videos of satellites being blasted off into space - but once they’re locked in orbit around the earth, how do we bring them back down?
The Telstar 1 satellite inspired a chart-topping pop tune, the iconic black-and-white hexagonal Adidas soccer ball, and maybe even a Doctor Who creature, the Mecanoids. National Physical Laboratory

Trash or treasure? A lot of space debris is junk, but some is precious heritage

Protecting culturally significant spacecraft enables people on Earth to feel connected to space as the common heritage of humanity.
Marcoo was a 1.4 kilotonne ground-level nuclear test carried out at Maralinga in 1956. The contaminated debris was buried at this site in the 1967 clean-up known as Operation Brumby. Author provided

Friday essay: the silence of Ediacara, the shadow of uranium

History is writ large in the remote areas around Woomera and the Nullarbor: from the fossils of microscopic, cell-like creatures to ancient stone tools to the deitrus of rocket tests and the painful legacy of the Maralinga atomic blasts.
The idea that there’s a moral imperative for humans to expand beyond Earth is echoed by influential proponents of space exploration. Tamara Craiu/Flickr

To boldly go toward new frontiers, we first need to learn from our colonial past

Technology had enabled humans to explore the deep sea, the Earth’s poles, and outer space. But we shouldn’t forget historical lessons about frontiers in the process of traversing them.
We can all reach for the stars in The Milky Way over Western Australia. Flickr/HuiChieh

We should encourage boys and girls to reach for the stars

The drive the get more women involved in science should start at an early age. But as one space researcher found out, girls can get nudged out of science at school.
Artist’s impression: Looking back 12.9-billion km towards the sun and the inner solar system from Sedna, one of the recently discovered minor planets in the Kuiper belt. NASA, ESA and Adolf Schaller

The long hunt for new objects in our expanding solar system

The search for new objects, including new planets, in our solar system has turned up some interesting finds. There have been a few failures over the years too.
Up into the imagination! John Polgreen/James Vaughan/Flickr

Scientists on their favourite science fiction

Have you ever wondered what real scientists think of science fiction? Here’s a selection of top pics from those in the know.
What could be out there? That question eventually led to the discovery of Pluto. ESO/L. Calçada

Finding Pluto: the hunt for Planet X

The existence of a “Planet X” in the outer solar system was the subject of great speculation, and was finally settled with the discovery of Pluto in 1930.
Artist’s impression of NASA’s New Horizons spacecraft encountering Pluto and its largest moon, Charon. NASA/Applied Physics Laboratory/Southwest Research Institute

Let the people decide new place names on Mercury and Pluto

Who gets to name the craters and features on our planets was once an ad hoc affair. But now the public can have a say with just days left to vote.
Not yet, but soon … we’re getting closer to sending people to Mars. Samantha T./Flickr

Near Earth and far away, it’s been an exciting year in space

It was an exciting year in space exploration, with mind-blowing triumphs and heart-breaking failures. On Earth, new rockets and spacecraft were tested by space agencies and commercial ventures. SpaceX…
Space can be at a premium in cemeteries … and when it runs out, reusing old graves is an option. William Murphy/Flickr

Losing the plot: death is permanent, but your grave isn’t

Headstones at the Dudley Park cemetery in Payneham, South Australia, were recently bulldozed as part of the ongoing “recycling” of more than 400 graves. Some people were shocked to realise that gravesites…

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