When young stars are forming, vast amounts of UV radiation are emitted. To confirm our suspicions of star formation we can select to look at data from different surveys, in different wavelengths. This might hint at star formation and stellar activity happening in the outer ring, but less so in the centre. In this galaxy, the outer ring appears to be more blue then the centre red section. It's important to note that things that look blue (shorter wavelengths) are generally hotter than things that look red (longer wavelengths). However, these are fairly representative of what the galaxy would look like with our own eyes.Ī general rule of thumb as an astronomer is that “colour” differences within galaxies are because of physically different environments. The colours we see represent different filters from this telescope. The first image of the Cartwheel Galaxy we see is from optical imaging by the Digitised Sky Survey. The location will be centred in the interface. In the Aladin interface, you can search for both the popular name of an object (like “cartwheel galaxy”) or known co-ordinates. Let's start our universal tour by searching for one of the most visually stunning galaxies out there, the Cartwheel Galaxy. Here we can scan the entire sky for hidden galaxies, and even decipher information about their stellar populations and evolution. Go online for a universe atlasĪladin Lite is one of the greatest online tools available to look at our universe through the eyes of many different telescopes. In some cases human eyes will only ever look at what the computers have deemed is interesting! Massive amounts of data are hosted online, just waiting to be admired, for free. In the 21st century we have access to information any time, anywhere via the internet.Īutomatic telescopes and surveys now provide us with so much data we require machines to help us analyse it. Only a few decades ago astronomers had to tediously examine photographic plates after a long, cold and lonely night of observing.
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