Sir The toxic spill by the mining company Boliden into the Guadiamar River and the Doñana Natural Park last April highlighted the lack of co-ordination between...
Visual Determination of the Mean Effective Chromospheric Thickness
IN the course of taking submillimetre chromospheric data from Concorde 001 during the eclipse of June 30 (ref. 1), it proved possible to record information on...
Water ice and organics on the surface of the asteroid 24 Themis
It has been suggested that Earth's current supply of water was delivered by asteroids, some time after the collision that produced the Moon (which would have...