Category: astronomy
Jupiter’s moon Io: some facts
Looking at the Earth through different eyes: the GRACE mission

Adapted from a talk given at #CSIROTweetup by Dr Daniel Shaddock (laser systems) Dr Paul Tregoning (geo data) ANU, supplemented with data from the GRACE mission home page. Image snarfed from the NASA/JPL GRACE page Most people associate going into space with exploring objects not on Earth, but many satellites…
Mars Curiosity Tweetup in Canberra!
How is the size of a planet related to its atmosphere
What if the Earth had no moon (part 2)
Once more on the search for exoplanets, and Alpha Centauri

This morning I came across this very interesting article on the Centauri Dreams website. By the way, Centauri Dreams, the website of the Tau Zero Foundation, is a very rich source for writers of realistic SF, especially in relation to planetary exploration and interstellar travel. The article summarises results and…
Communication in space

Electromagnetic waves, whether gamma ray, microwave, radio or visible light frequencies, travel through vacuum at the speed of—well, uhm—light. When on Earth, this means communication is pretty much instant. If the distance travelled in one second by a photon, a light particle, were a string, it would wrap around the…