Possible ring material around centaur (2060) Chiron

Possible ring material around centaur (2060) Chiron

We propose that several short-duration events observed in past stellar occultations by Chiron were produced by ring material. Some similarities between these events and the characteristics of Chariklo’s rings could indicate common mechanisms around centaurs. From a reanalysis of the stellar occultation data in the literature, we determined two possible orientations of the pole of Chiron’s rings...

Water Ice in 2060 Chiron and Its Implications for Centaurs and Kuiper Belt Objects.

We report the detection of water ice in the Centaur 2060 Chiron, based on near-infrared spectra (1.0-2.5 µm) taken with the 3.8 m United Kingdom Infrared Telescope and the 10 m Keck Telescope. The appearance of this ice is correlated with the recent decline in Chiron's cometary activity: the decrease in the coma cross section allows previously hidden solid-state surface features to be seen. We ...

Ring around the chromatin

ells with shortening telomeres hit two successive barriers: they first stop dividing as they become senescent, and later undergo a cell death process termed crisis. Although crisis may, as suggested by others, be controlled by overall telomere length, and colleagues now blame the onset of senescence on a particular structure at the end of telomeres. The important structure is a single-stranded ...

CHIRON efficiency

Ring around the wound

Neurons born in new places eurogenesis in the adult brain is generally considered to be restricted to the hippocampus and olfactory bulb—ancient parts of the brain that are found even in nonmammalian species. A few publications suggested that the neocortex—a well-developed region in primates that is implicated in higher thought—also supports neurogenesis. These reports have been met with skepti...