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Need To Know with Dr Karl

The truth about cat and dog years

The idea behind ‘pet years’ is to have a simple way to compare the life stages of our pets to human life spans. The standard understanding is that one pet year equals seven human years. However, the reality is much more complex. After all, most one-year-old pets can make babies – but seven-year-old humans cannot. 

Science & Environment

Celebrating Tidbinbilla

I’m often asked about the space probes that are leaving the solar system, never to return. There are five of them: Pioneer 10 and 11 and Voyager 1 and 2 – all launched in the 1970s – and New Horizons, which began its journey to Pluto and beyond in 2006.

Space

Alien volcanos

Once in a while, our planet reminds us of its awesome power by releasing a little of the magma that permeates its mantle in a volcanic eruption.