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In this classroom activity students use real data with the physics of forces and circular motion to calculate the altitude at which space begins.

Students calculate the Schwarzschild radius of a black hole with the same mass as the Earth and one with the mass of the Milky Way. Accompanies the video 'What's inside a black hole?'.

Students use Kepler's 3rd law and Saturn's orbit to calculate the mass of the Sun. Accompanies the video 'How do we know how old the Sun is?'.

In this activity students use Einstein's most famous equation to calculate the amount of energy released from nuclear fusion reactions in the Sun. Accompanies the video 'How do we know how old the Sun is?'.

A classroom activity with instructions to accompany the video "Alien worlds and the Doppler effect".

A classroom activity in which students explore weight and mass by comparing the strength of gravity at different places in our Universe. Accompanies the video 'What is Gravity?'

Life began on the Earth around 3.5 billion years ago. Could life have evolved on other planets and if so where are they? Astronomers at the Royal Observatory Greenwich explain how we might detect them in this video.

In this video, Royal Observatory Greenwich astronomer Radmila demonstrates how the Doppler effect can be applied to finding planets orbiting distant stars in our galaxy called exoplanets. She carries out a short demo from which data can be collected and analysed and explains how these techniques can be applied to light and the hunt for exoplanets.

A classroom activity in which students use Hubble's law to derive the age of the Universe and consider the assumptions and sources of error associated with this calculation.

In this practical activity, students use F=ma to calculate the acceleration due to gravity and can investigate how the area of a parachute can affect the landing force of a space probe. Accompanies the video Newton's Laws of Motion.