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Measuring the Earth-Sun distance during a lunar eclipse
Measuring Earth-Sun distance lunar eclipse
2011/9/28
The classical method for measure the Earth-Sun distance is due to Aristarchus and it is based upon the measure of the angle Moon-Earth-Sun when the Moon is exactly in quadrature. Such an angle is only...
Using the European Southern Observatory´s Very Large Telescope (VLT), astronomers from the University of Sheffield have detected a stellar mass black hole much farther away than any other previo...
A project to determine an accurate distance to M31 using eclipsing binaries as standard candles
accurate distance eclipsing binaries M31
2009/6/11
A project to determine an accurate distance to M31 using eclipsing binaries as standard candles。
KW4 Keeping its Distance, For Now（ 图）
asteroid KW4
2006/11/20
Nov 19, 2006: The Arecibo Observatory has made new observations of a binary near-Earth asteroid named . Studying the formation and evolution of such near-Earth asteroids helps researchers learn how to...