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.
The quantitative human chorionic gonadotropin (hCG) blood test measures the level of hCG hormone present in a sample of your blood. HCG is a hormone that is produced during pregnancy. Your doctor may refer to the hCG quantitative test by another name, including: 1  quantitative serial beta-hCG test.