Our knowledge of Mars increases with every satellite in orbit and on the surface.Here are some earlier images which give an insight into the wide variety of the craters.The final image is of a crater 85ºS. Does it remind you of anyone?
Objects in space rarely look the same in different wavelengths.Here 3C58 changes quite dramatically moving from soft to hard x-rays and in radio.Overlaying the x-ray on to of the visible gives and idea of the different scales of the object.Finally, putting them all together gives an 'artists rendering' idea of how it might appear if we could see all of those images at once.
The only 'Wandering Star' you can see easily in the Northern hemisphere.During a human lifetime, the 30 minute field around Mu Cassiopeia demonstrates that it has largest proper motion of any naked eye star. Indeed, it has the 2nd largest of any star.
How can astronomers look in any direction and see the 'Big Bang'?Look in one direction and look back 13 billion years. Look in the opposite a see the same time. So the Universe is 26 billion light years across, right? WRONGIt is so easy to confuse space and time when they are so bound up together.Indeed you have to change your geometry to understand it. In this instance to spherical.
It might come as a surprise to find that astronomers have discovered that the Earth has several small moons as well as The Moon.Stable orbits for small objects can be found at the ?Lagrangian points? between the Earth and SunBut some small objects co-orbit withthe earth, too.
Janus and Epimetheus are the two satellites between Saturn's E and F rings. They are only separated by about 50 kilometers (31 miles). Around every four years these two satellites approach each other and they dance around each other to swap orbits - the inner satellite becomes the outer and the outer moves to the inner position.
When working with infra-red Spitzer images, you have to remember that all the colours are false.Here the colours emphasise the small details, such as the inner ring of material glowing warmly.
Hubble image of a fillament of this supernova remnant has a very small object which seems to be a planetary disk. Astornomers have long proposed that supernovae explosions 'seed' the galaxy with the heavy atoms from which we are all composed. This may be the very first direct example of this in action
