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 human chorionic gonadotropin (hCG) test is done to check for the hormone hCG in blood or urine.Some hCG tests measure the exact amount and some just check to see if the hormone is present. HCG is made by the placenta during pregnancy.The hCG test can be used to see if a woman is pregnant or as part of a screening test for birth defects.CG is made by the placenta during pregnancy. The hCG test can be used to see if a woman is pregnant or as part of a screening test for birth defects.