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A little interesting about space life.

Judith E. Braffman-Miller is a writer and astronomer whose articles have been published since 1981 in various newspapers, journals, and magazines. Although she has written on a variety of topics, she particularly loves writing about astronomy because it gives her the opportunity to communicate to others the many wonders of her field. Her first book, "Wisps, Ashes, and Smoke," will be published soon.



and here is another

Kepler-22b, with its radius almost two and a half times that of Earth, is too large to be considered a true Earth-analog. Nevertheless, if it possesses an Earth-sized moon, the planetary system could still host a habitable world like our own.



and finally

In order to spot such a remote exomoon, the authors of this new study, The Hunt for Exomoons with Kepler (HEK): III. The First Search for an Exomoon around a Habitable-Zone Planet, used a technique that models the dips and features of the parent star's light-curve (stellar brightness vs. time), which are caused by transits of the planet (and any accompanying moons) in front of the face of its star. This is a complicated and difficult endeavor because numerous and diverse models of planet-moon dynamics must be taken into consideration. Each one of these models possesses parameters that describe physical properties belonging to the planet or moon, as well as parameters describing the orbital system. The authors use what is termed Bayesian statistics to account for the fact that the true orbital model of this planetary system is still not known--and this enables them to calculate if a model with our without a moon fits the observed light-curve the best.

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The beautiful, banded, blue ice-giant planet, Neptune, is the furthest major planet from the Sun. It is also orbited by a very weird large moon that may not have been born a moon at all. The moon, Triton, is about 1,680 miles in diameter, and sports features that eerily resemble those found on the dwarf planet Pluto. Pluto is a denizen of the Kuiper Belt. The Kuiper Belt is a reservoir of comets and other icy bodies--some large, some small--that circle around our Sun beyond the orbit of Neptune, at a distance of about 30 to 55 Astronomical Units (AU) from our Star. One AU is equal to the average distance of Earth from the Sun--approximately 93,000,000 miles.



The first observations of Mars as an object traveling in Earth's night sky was recorded by the ancient Egyptian astronomers, and by 1534 BCE the ancient astronomers were familiar with the retrograde movement of the planet. By the time of the Neo-Babylonian Empire, the Babylonian astronomers were making regular records of the positions of the planets, as well as systematic detections of their behavior. In the case of Mars, the ancient astronomers realized that it made 42 circuits of the zodiac every 79 years. These scientists of long ago even invented arithmetic methods so that they could make minor corrections pertaining to the predicted positions of the planets inhabiting our Solar System. The ancient astronomers referred to the planets as "wandering stars".



Now, by pinpointing the precise birthday of the Moon, Dr. Jacobson and his team can help to explain why the Moon and our planet are so mysteriously similar in their compositions.