What is mass? Physics
This truck has a lot of mass. Mass is a measure of the number of atoms in an object combined with the density of those atoms. Usually people measure mass in kilograms. You can tell [...]
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08, 2017
Mars, the red planet – Astronomy
Mars, the way the planet looks from space Which planet is Mars? The closest planet to Earth is Mars, and Mars is also the planet that seems most likely to have life on [...]
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08, 2017
Main sequence stars – Astronomy
Main sequence stars: A starry sky with the Milky Way galaxy (thanks to Bernd Nies) What is a main sequence star? Nine out of ten stars that you see in the sky [...]
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08, 2017
Jupiter – Planets – Astronomy
Jupiter from space Jupiter (named after the Roman god Jupiter) is the next planet further out from our Sun after Mars. But Jupiter is much, much further away from the Sun than Mars is. If [...]
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08, 2017
What is inertia? Physics – Science
The bus is heavy, so it's hard to get it moving. Who first wrote about inertia? A law of physics first suggested by the Uzbek scientist Ibn Sina about 1000 AD states that [...]
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08, 2017
Space – Astronomy – Physics
Lyrid meteor shower - Space Most of the universe is just emptiness - there is nothing there at all. It's dark. That's space. But within the space there is a [...]
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08, 2017
What is gravity? Physics
What is gravity? The Moon orbiting Earth (taken from space) - NASA What does gravity do? Gravity attracts all objects towards each other. Gravity has been around since the very [...]
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08, 2017
What is a galaxy? – Astronomy – Space science
The galaxy M 100, seen through the Hubble telescope What is a galaxy? A galaxy is a group of millions of stars that are relatively near each other. Most stars seem to [...]
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08, 2017
Eclipse of the sun – Astronomy
Eclipse of the sun, showing the corona Why do eclipses happen? An eclipse of the sun happens whenever the moon gets between the Earth and the sun, so that the moon blocks your view of [...]
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08, 2017
Eclipse of the Moon – Space science
An eclipse of the moon. You can see the curved shadow of the Earth. What is an eclipse of the moon? An eclipse of the moon happens when the Earth gets between [...]
