Black holes, quasars and active galaxies. Black holes are objects so dense, and with so much mass, that even light cannot escape their gravity. The existence of black holes has been theorised for more than 200 years. It is impossible to observe them directly, and astronomers had no way to test their theories until Hubble arrived.
Sequence IIIG Test Method. Sequence IIIG testing for automotive engine oils. The Sequence IIIG Test is a fired-engine, dynamometer lubricant test for evaluating automotive engine oils for certain high-temperature performance characteristics, including oil thickening, varnish deposition, oil consumption, and engine wear.
What is NIPT? NIPT (noninvasive prenatal testing) is a blood test that can detect Down syndrome and a few other chromosomal conditions at 10 weeks of pregnancy or later. (You can also find out your baby's sex.) You may have heard these tests called by their brand names: Harmony, MaterniT21, Panorama, and Verifi.