Narrative report on the hazard to civilization due to fireballs and comets by S. V. M Clube
(
Book
)
3
editions published
in
1996
in
English
and held by
3
libraries
worldwide
The 100,000 year average interval between asteroid strikes (Chapman & Morrison 1994) first became apparent during the 1970s. Another discovery of considerable moment about this time was that of object Chiron. Considered to be a "giant comet" and found to be moving in a chaotic orbit beyond Saturn close to the ecliptic (Kowal 1979,Oikawa & Everhart 1978), the possibility of its future transfer to a more stable sub-Jovian orbit capable of penetrating near-Earth space and hence threatening the Earth was also soon recognized (Bailey et al 1994, Steel et al 1994). The report then is by way of being a flier delineating the current state of research (historical and scientific) concerning the cometary and fireball threat
Galactic dark matter and terrestrial periodicities by S. V. M Clube
(
Book
)
3
editions published
in
1998
in
English
and held by
3
libraries
worldwide
Analysis of recent geological databases reveals the presence of a ^26.5 Myr periodicity in the terrestrial record of the last ^200 Myr. The same periodicity is found to be present, at a high confidence level, in the record of impact cratering on Earth. It thus appears that global disturbances are modulated or caused largely by exogenous forcing. The likely source is a periodic comet influx caused by Oort cloud disturbance as the Sun oscillates vertically through the Galactic disc. The Earth may thus be regarded as a probe of the disc environment; and to account for the periodicity, the Galactic disc is required to have a substantial dark matter component (^approx .15 molar mass/cu pc). The purpose of this paper is to review the relevant observational framework, and to describe the basic astro- and geo-physical processes which now seem to underpin evolution on Earth. The resulting current hazard to Earth, amounting to a more substantial input and explosion megatonnage in toto, is both more complex and more profound
Giant comets, evolution and civilization by S. V. M Clube
(
Book
)
4
editions published
in
1998
in
English
and held by
3
libraries
worldwide
Climatic cycles, ice epochs, mass extinctions and other global disturbances may be attributed to episodes of bombardment by giant comets. Such bodies now in chaotic orbits beyond Jupiter present the most serious current celestial hazard. A point at issue is the greater complexity of the cometary as opposed to the asteroidal hazard, as well as its more pervasive effects
Proper motions of RR Lyrae variables
(
Book
)
in
English
and held by
2
libraries
worldwide
The profiles of chromospheric H[Alpha] and D3 from interferometric observations by S. V. M Clube
(
Book
)
2
editions published
in
1958
in
English
and held by
2
libraries
worldwide
The proper motions of RR lyrae variables, Part 2 by S. V. M Clube
(
Book
)
1
edition published
in
1971
in
English
and held by
1
library
worldwide
Interferometric Measurements of wave-lengths by Michael George Russell Adam
(
Book
)
in
English
and held by
1
library
worldwide
An absolute system of proper motions by S. V. M Clube
(
Book
)
1
edition published
in
1966
in
English
and held by
1
library
worldwide
Proper motions of RR Lyrae variables
(
Book
)
1
edition published
in
1971
in
English
and held by
1
library
worldwide
Related Identities
