The Government has offered Australia's three mobile operators, and vividwireless, renewal of their existing spectrum allocated on 15 year licences in the late 90s and early 2000s at set prices, while the Government expects to rake in $3 billion.
The effect occurs because asteroids are generally irregular - often potato-shaped - rather than spherical. Solar energy is absorbed and then re-radiated into space, but because of the asymmetry there is a net twisting effect which alters the asteroid's rotation.
But the forces involved are tiny, and therefore have a very small impact. Two teams of scientists working independently have published their results observations this week, both reporting changes measured in milliseconds per year.
A UK-based team observed the 114m diameter asteroid 2000 PH5 using optical and radar measurements, and found its 'day' is shortening by one millisecond per year. If this continues over tens of millions of years, 2000 PH5 is likely to break into two or more pieces.
Meanwhile, a Finland-based team re-analysed existing observations of a larger asteroid, the 1.4km diameter 1862 Apollo, and found a change of four milliseconds per year.
The significance of these findings lies in their contribution to our overall understanding of the evolution of the solar system.
David Bass
| ComOps, a leading Australian provider of business software products and services, has won a competitive tender to deploy its Salvus safety, r…
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