* Astronomy

Authorities are investigating the cause of a large tremor felt across a 70-kilometre stretch of the New South Wales mid-north coast.
Emergency call centres were inundated with calls from residents who reported a tremor that shook windows and doors in Taree and surrounding areas.
But the Government seismology body, Geo Science Australia, says it was not an earthquake, and
the weather bureau says no unusual weather was recorded in the region.
The Defence Force is checking whether any of its high speed aircraft were flying over the area, which could have caused a sonic boom.

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