The Earth’s core is cooling down, and one day it will be completely solid – when that happens, Earth might look a lot like Mars.
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Long ago in the distant past, our entire Universe was microscopic – just like an atom – and obeyed completely different rules of cause and effect.
I have worked on this problem for many years, and to be honest it still blows my mind to really think about just how complex it is.
It can actually be very tricky to define a species, but in the 1900s, scientists found a pretty good way.
I’ve worked with NASA’s Mars Exploration Rover Project for 16 years. If you got yourself a ticket to Mars, here’s how I’d advise you to prepare. And by the way, any mistake could kill you.
If you see moths and their larvae near your clothes, it’s a sign that it’s time to wash all your clothes and air them out in the sun.
Even the Voyager spacecraft are controlled remotely, 20 billion kilometres away. It takes 20 hours for instructions to travel from Earth to the spacecraft but we can do it – using a remote.
When water turns from a gas into a liquid, it forms droplets. Whether those droplets are dew or rain depends on where the droplet forms.
The energy needed to pull magnets apart comes from you, and you get it from the food you eat. And the plants or animals you eat get their energy from other plants and animals, or from the Sun. All energy comes from somewhere.
There are probably more than a million planets in the universe for every single grain of sand on Earth. That’s a lot of planets. My guess is that there probably is life elsewhere in the Universe.
The parts of the brain that get ‘smell signals’ from the nose also do other things, such as storing memories or provoking emotions. That is why some smells can bring back old memories.
Every human carries an instruction booklet with a very special code, called DNA. Our eyes cannot read the code, but our bodies can. The code tells our body what to do and how to look.
Are there stars other than the Sun that might explode soon close to us? Yes, there are! As long as by ‘soon’ we mean within a million years.
There are lots of places where it’s much, much hotter than the Sun. And the amazing thing is that this heat also makes new atoms - tiny particles that have made their way long ago from stars to us.
Dropping leaves might seem like a waste, but plants are actually saving nutrients.
Like reptiles, birds do not have two separate exits from the body. They have one, called the cloaca. It is quite similar to the human anus but the cloaca expels both indigestible bits and toxins.
Bush flies and blowflies all vomit on their food, but other flies are a little more polite at the dinner table and don’t vomit at all.
Just like a mobile phone, your body needs to be recharged every day. You need to eat food and drink water every day to keep your body going. Some foods are better than others at helping you stay well.
Don’t try this at home, kids.
Dog skin is exactly the same as yours and mine! It changes colour depending on how much light it’s exposed to.
Kontributor teratas
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Reader in Astrophysics, Keele University
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Associate Professor of Science & Medicine, Bond University
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PhD Candidate, University of Southern Queensland
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Professor (Astrophysics), University of Southern Queensland
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Associate Professor, Philosophy of Science, The University of Melbourne
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Lecturer, Centre for Astrophysics and Supercomputing, Swinburne University of Technology
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Researcher, The University of Melbourne
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Professor, Macquarie University
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Senior Teaching Fellow, Medical Program, Bond University
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Associate Professor, School of Animal and Veterinary Science, University of Adelaide
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Lecturer, University of Southern Queensland
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Senior Lecturer in Physics, University of New England
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Associate professor, Astronomy, University of Regina
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PhD Candidate, The University of Queensland
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Honorary Associate Professor, UNSW Sydney
