Physics – Geophysics
Scientific paper
Jun 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011a%26g....52c...6.&link_type=abstract
Astronomy & Geophysics, Volume 52, Issue 3, pp. 3.06-3.06.
Physics
Geophysics
Scientific paper
The usual way to get a close-up of an asteroid is to fly a spacecraft there and have a look. But this is never going to be a routine means of studying the smaller members of the solar system, and space missions don't exactly come cheap. So when an asteroid heads close to Earth, the obvious thing to do is to take a close look.
Gravity Probe B, the NASA mission to carry out the most sensitive test yet of general relativity, has concluded that Einstein was right. The team measured the predicted distortion of spacetime around Earth from the mass of the planet, and demonstrated that the rotation of the Earth does indeed twist spacetime, causing frame dragging.
Predictions about the orbit of an exoplanet came good when observations pinned down the properties of 55 Cancri e, to show it was both hotter, denser and closer to its star than had been thought.
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