Before the woman took pH๏τos of the strange objects in Australia on March 21, dozens of similar cases had occurred around the world in the past year.

Fiona Hartigan, a woman in Australia, saw three objects in the sky over Sydney on March 21. PH๏τo: Daily Telegraph

On an evening in early March 2010, a blue light appeared above the windmills in Downham Market, Norfolk, England. PH๏τo: Peter Rye.

A giant obelisk hovered over the Kremlin in Moscow on December 18, 2009. Many witnesses claimed that it circled over Red Square for hours and could be nearly 1.5 km in diameter. PH๏τo: Telegraph.

A V-shaped object in the sky over Chongqing, China on August 27, 2009. It kept changing between red, blue, green, yellow and white. After hovering for about half an hour, the object disappeared. PH๏τo: People Daily.

A strange object in the sky near the capital Buenos Aires, Argentina on December 26, 2009. Analysis results showed that it was a solid object. PH๏τo: Alexander Mikitiuk.

While leaving the Carlsbad cave complex in New Mexico to return home to Texas, USA, on October 3, 2009, a man with his wife and son saw some strange lights moving above. PH๏τo: mufon.com.

Brian Lee, a 55-year-old man, was driving on a road near the village of South Somercotes in County Louth in the northeast of the Republic of Ireland on an unspecified day in 2009 when he stopped to take pictures of the sunrise. Later, when reviewing the pH๏τos, he saw something unusual hovering above the road. PH๏τo: Brian Lee.

While observing the sky on the evening of March 31, 2009, Ahmad Zaigham, a British citizen, saw an object emitting light through the clouds above the town of South Harrow near London. After Zaigham took a pH๏τo, the light faded and the object sH๏τ up at great speed. PH๏τo: Ahmad Zaigham.

A mysterious object appeared in the airspace of South Carolina, USA on March 16, 2009. PH๏τo: Greg.

A woman was walking her dog by the river near Ely Cathedral, Cambridgeshire, England on an unspecified day in 2009 when the animal suddenly panicked. The woman looked up and saw an object flying above the church. PH๏τo: Archant Herts & Cambs.

A disc-shaped object appeared in the airspace of San Diego, California on January 10, 2009. A resident took this pH๏τo with a mobile phone. The object disappeared shortly after the witness took the picture. PH๏τo: mufon.com.

A man named Robson Bolam saw something moving in the sky over Telford, Shropshire, England one day in January 2009. Many other residents also confirmed that they saw the object at the same time. PH๏τo: Robson Bolam