As lunar missions become increasingly frequent, the absence of a standard time zone on the moon poses logistical challenges.

But this week in The Astronomical Journal, US researchers laid out the first thorough blueprint for establishing a consistent lunar time zone. Guest: Dr Jonathan Webb, ABC Science Editor

Brainteaser (answer in the audio): Jupiter is the largest planet in our solar system - and Mercury is the smallest. Venus is the hottest - and Neptune is the coldest.What way of ordering the planets would place Earth first and Saturn last?