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Habitable zones around main sequence stars.
TLDR
The results suggest that mid-to-early K stars should be considered along with G stars as optimal candidates in the search for extraterrestrial life.
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A slightly more massive young Sun as an explanation for warm temperatures on early Mars.
The valley network channels on the heavily cratered ancient surface of Mars suggest the presence of liquid water approximately 3.8 Gyr ago. However, the implied warm climate is difficult to explain…
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Persistent evidence of a jovian mass solar companion in the Oort cloud
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Are periodic mass extinctions driven by a distant solar companion?
Raup and Sepkoski1–3 have recently reported evidence for a 26-Myr cycle in biological mass extinctions which, if real, requires an astronomical explanation. Here we investigate a model in which this…
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Cometary Evidence of a Massive Body in the Outer Oort Clouds
Approximately 25% of the 82 new class I Oort cloud comets have an anomalous distribution of orbital elements that can best be understood if there exists a bound perturber in the outer Oort cloud.…
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Habitable Planet Formation in Binary Star Systems
Abstract Assuming current models of terrestrial planet formation in the Solar System, we numerically investigate the conditions under which the secondary star in a binary system will inhibit planet…
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Planet X and the origins of the shower and steady state flux of short-period comets
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Periodic comet showers and planet X
The discovery1 that Pluto's mass is insufficient to explain the discrepancies in the motions of the outer planets has led to the prediction of a tenth planet (planet X) of mass ∼1–5 M⊕ beyond the…
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Tidal Imprint of Distant Galactic Matter on the Oort Comet Cloud
We report the detection of a remarkably strong nonrandom signal in the distribution of perihelia vectors of Oort cloud comets. The strongest signal is in the Galactic longitudes of perihelia, and we…
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Planetary Habitability and the Origins of Life
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