The First Trimester Screen is a new, optional non-invasive evaluation that combines a maternal blood screening test with an ultrasound evaluation of the fetus to identify risk for specific chromosomal abnormalities, including Down Syndrome Trisomy-21 and Trisomy-18.
According to NASA, the next total lunar eclipse will be on January 31, 2018, and will be seen in Asia, Australia and North America. Penumbral lunar eclipses will occur on March 23, 2016, September 16, 2016, and February 11, 2017. Penumbral eclipses are more difficult to observe because only part of the moon is eclipsed.
The next predicted perihelion of Halley's Comet is 28 July 2061, when it is expected to be better positioned for observation than during the 1985â1986 apparition, as it will be on the same side of the Sun as Earth.