Brenan Dew is an astronomy guide at Sydney Observatory and is currently working on his PhD at Macquarie University. Below he discusses the history of Sydney Observatory. Little has changed on Observatory Hill since Sydney Observatory first opened its doors 158 years ago, back in 1858.

Les Dalrymple is a guide at Sydney Observatory and a keen all hours observer. Below he discusses one of our nearest neighbours, the red planet Mars. Many have been outside in the early hours of the morning observing the parade of five planets in the pre-dawn sky.

Dr Rajan Chhetri is a guide at Sydney Observatory. He researches Active Galactic Nuclei (AGNs) and below discusses the interesting phenomenon that blacks holes might twinkle. We've all sung or heard the nursery rhyme "twinkle twinkle little star".

Les Dalrymple is a guide at Sydney Observatory and a passionate deep sky observer. Below he discusses one of his favourite objects to observe – a supernova. Supernovae are usually associated with a gigantic star that has exhausted its nuclear fuel, undergone core collapse followed by a brilliant explosion leaving behind a pulsar or possibly a black hole.

Kirsten Banks is a guide at Sydney Observatory and is currently studying physics at UNSW. Below she discusses a recently observed supernova and explains what supernovae are. Astronomers have recently discovered a monster supernova as bright as 570 billion Suns!