50 citations · 174 across the 7 of their papers we have counts for
7 papers
The hazard from fragmenting comets
W. M. Napier
Comet disintegration proceeds both through sublimation and discrete splitting events. The cross-sectional area of material ejected by a comet may, within days, become many times gr…
Giant comets and mass extinctions of life
W. M. Napier
I find evidence for clustering in age of well-dated impact craters over the last 500 Myr. At least nine impact episodes are identified, with durations whose upper limits are set by…
Palaeolithic extinctions and the Taurid Complex
W. M. Napier
Intersection with the debris of a large (50-100 km) short-period comet during the Upper Palaeolithic provides a satisfactory explanation for the catastrophe of celestial origin whi…
Impact cratering and the Oort cloud
J. T. Wickramasinghe, W. M. Napier
We calculate the expected flux profile of comets into the planetary system from the Oort cloud arising from Galactic tides and encounters with molecular clouds. We find that both p…
Ultraluminous X-ray Sources, High Redshift QSOs and Active Galaxies
G. Burbidge, E. M. Burbidge, H. C. Arp +1
It is shown that all of the 32 point X-ray sources which lie within about 10' of the centre of nearby galaxies, and which have so far been optically identified are high redshift ob…
An anomalous concentration of QSOs around NGC 3079
E. M. Burbidge, G. Burbidge, H. C. Arp +1
It is shown that there are at least 21 QSOs within 1 degree of the nearby active spiral galaxy NGC3079. Many of them are bright (mag<18) so that the surface density of those closer…