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Listed under:  Science  >  Earth and space  >  Universe  >  Planets
Video

Triple J: Why is Pluto not a planet?

Watch this clip and learn why Pluto was taken off the official list of planets. Dr Karl Kruszelnicki explains the three criteria that must be met before planets can be called planets. What are they?

Video

Why we can see some planets but not others

In this planetarium demonstration, the air has been sucked out of the sky to give us a black sky so we can actually see the planets that are above us. Why is it that we can't always see the planets? How does our proximity to the sun affect how visible a planet is to us?

Video

Catalyst: Scaling down our solar system

Can you imagine how huge the Sun is, or how far away planets such as Saturn are? Watch this clip to discover how 'mind-bending-ly big' the solar system is. Presenter, Bernie Hobbs, scales down the the solar system to fit into a football field to demonstrate the relative sizes and distances of the Sun and planets. Find out ...

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Solar wind gives asteroids a tanning

This brief ABC News in Science article from 2009 explains that asteroids become redder the longer they stay out in the sun because of the solar wind. Scientists are using this to try to find our more about our planetary origins.

Interactive

Solar System Quiz

This is a non-threatening ten question multiple choice quiz that gives students feedback on their understanding of our solar system that continues to reveal amazing facts and inspire some out-of-this-world fantasy. Excellent explanations given in the feedback. A useful resource to stimulate discussion or establish student ...

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How the sky works

This ABC Astronomy Basics article is an excellent example of simple explanations of many of the phenomena we observe in the sky. Features such as constellations, neighbouring galaxies and nebulae are outlined. It explains that finding constellations and planets in the ever-moving night sky can be challenging. It gives tips ...

Image

Orrery, c1770 - part 1

This is a close-up of a mechanical model of part of the solar system, commonly known as an orrery, made by renowned London instrument maker Benjamin Martin in about 1770. This bronze model features a cylindrical clockwork mechanism with an orb representing the Sun placed in the centre. Extending from this on an arm is a ...