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Star trails taken during Eta Aquariid meteor shower over Jamberoo. Click through to see meteor trails.When are the best times to see meteor showers?

What are meteor showers and how often do they happen? When and where is the best place to catch the Eta Aquariid meteor shower this week? What's the best way to photograph them? Article has photo slideshow

Sinkholes form in limestone, such as that found along the Limestone Coast in South AustraliaWhat causes sinkholes?

What causes sinkholes? And are we likely to experience any in Australia? Article has photo slideshow

Scientists have detected gravitational wave signatures in the cosmic microwave background radiationWhat do gravitational waves tell us about the Universe?

What are gravitational waves? What do they tell us about the Universe? What makes the discovery of gravitational wave signatures so significant?

Air traffic controllers mostly use secondary radar to track commercial aircraft and only use real radar in the case where transponders are not fitted, are turned off or are broken How does radar work?

What is radar and how is it used to track aircraft?

Flap: Hummingbirds have high speed wings that are swept back like the wings of a jet fighter and taper to a slender, elliptical tipWhy do some birds flap their wings while others glide?

Why do some birds flap their wings constantly, while others flap their wings, then fix them in position like an aircraft and glide, then flap them again or act as dive bombers? Article has photo slideshow

An occultation of Saturn as seen from the UK in March 2007. How often do we see an occultation of Saturn?

We haven't seen an occultation of Saturn from Australia in over 10 years, but this year we get to see three. Why do we see none for a while then a lot come at once?

A burning seam of coal presents a huge challenge to firefightersWhy do coal fires burn for so long?

Why do coal fires take so long to put out? How often do they happen? [an error occurred while processing this directive] comments

When we are in REM sleep we tend to dream and our body is semi-paralysedWhy do we roll over when we're asleep?

What makes us suddenly uncomfortable on one side and needing to change to the other when we're in bed, and during what sleep phase are we more likely to do it? [an error occurred while processing this directive] comments

Snow chance: Thanks to adjustments to the four-year leap year cycle there's no chance Australians will have a white Christmas in the futureWhat stops Australians having a white Christmas?

Is it true that the effect of the Earth's wobble, which changes winter to summer over a period of 13,000 years, has been corrected by the implementation of the 'leap year'?

Fracking is always used for the extraction of gas from shale deposits. The Moomba shale area in South Australia has 700 gas wellsWhat is fracking?

We hear a lot about fracking as a mining technique for extracting gas from coal seams and shale deposits. How is it done? And when is it used?

Red rock: the red colour of Uluru is due to the oxidisation or the rusting of the iron-bearing minerals within the rockHow did Uluru form?

Can we still see the original mountain range that formed Uluru and Kata Tjuta? [an error occurred while processing this directive] commentsArticle has photo slideshow

Three fundamental elements influence the way fires burn: weather, topography, and fuel How do you identify what started a bushfire?

How do they work out whether a bushfire was started by lightning strikes, sparks from an electricity pole, cigarette butts or deliberately lit?

A false color image of the Thermopolis Archaeopteryx. This image is a composite blend of scans for the elements phosphorus, silicon, sulfur, and iron. The bright colors in the wing areas show how part of the feather chemistry has been preserved. Top left panel: An anaglyph made from phosphorus and iron showing detail of skull and manus claw.Have any feathered dinosaur fossils been found in Australia?

Why do we only hear about feather dinosaurs being unearthed in the northern hemisphere? Have any feathered dinosaur fossils been found in Australia? [an error occurred while processing this directive] comments

The very beautiful Eucalyptus coccifera dominates Tasmania's tree line. It grows up to an altitude of 1200 metresWhy don't trees grow above a particular altitude?

Why is it that after one billion years of evolution trees still do not grow above the 3,000 metre level? Have they shifted with time? [an error occurred while processing this directive] commentsArticle has photo slideshow

Sound of spring: The channel-billed cuckoo heads to Australia at the beginning of September to invade the nests of a range of native speciesHow do cuckoos know they are cuckoos?

How do the chicks of birds that use other birds to raise their young, such as cuckoos and koels know that they are cuckoos or koels and not the other type of bird? [an error occurred while processing this directive] commentsArticle has photo slideshow

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