As wildfires have become more common researchers have been learning that wildfire smoke, depending on what it consists of, can be even more dangerous to public health than other types of air pollution.

Dr Balaji said opportunities to spot the comet may occur "in the days around perihelion, depending on local conditions and the comet's behaviour".

This structure is designed to hold six or seven people, depending on their weight, according to Giwusa.

But the way a child processes the events of the past week can vary greatly depending on how the adults in their lives help them understand it.

The Santa Ana winds go by various names, depending on where you live.