It's so annoying that this spectacular nebula is only visible to observers in the southern hemisphere. It's much bigger and brighter than the Orion nebula which we can see throughout the winter months from the UK. The Carina nebula is home to the most enigmatic star in our entire galaxy - namely Eta Carinae. The star is more than 100 times the mass of the Sun which makes it one of the largest stars we know. It's currently the most luminous star in the Galaxy and it fluctuates alarmingly in brightness, sometimes rivaling the brightest star in the sky but it's just below naked eye visibility at the moment. It's thrown out two gigantic lobes of dust and gas and is becoming quite unstable. It will end its life in a supernova explosion during the next few thousand years.