3,246 research outputs found
What It Means to be a Catholic in the United States in the Year 1991
John T. Noonan, Jr. describes the situation of the US Catholic in the late 20th century. He addresses claims of a changed Christianity and of a Christianity that will not stand the test of time. Within his speech, he remarks that the teachings and tradition of the Church, along with interpretations of Scripture, are taught and done in such a way that aligns with the context of the times. By doing so, he reinforces the longevity and indissolubility of the Church Herself.https://ecommons.udayton.edu/uscc_marianist_award/1004/thumbnail.jp
Water production rates and activity of interstellar comet 2I/Borisov
We observed the interstellar comet 2I/Borisov using the Neil Gehrels-Swift
Observatory's Ultraviolet/Optical Telescope. We obtained images of the OH gas
and dust surrounding the nucleus at six epochs spaced before and after
perihelion (-2.56 AU to 2.54 AU). Water production rates increased steadily
before perihelion from molecules s on Nov. 1,
2019 to molecules s on Dec. 1. This rate of
increase in water production rate is quicker than that of most dynamically new
comets and at the slower end of the wide range of Jupiter-family comets. After
perihelion, the water production rate decreased to
molecules s on Dec. 21, which is much more rapidly than that of all
previously observed comets. Our sublimation model constrains the minimum radius
of the nucleus to 0.37 km, and indicates an active fraction of at least 55% of
the surface. calculations show a variation between 57.5 and 105.6
cm with a slight trend peaking before the perihelion, lower than previous and
concurrent published values. The observations confirm that 2I/Borisov is
carbon-chain depleted and enriched in NH relative to water.Comment: 12 pages, 3 figures, 2 tables, submitted to ApJ
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