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.
EMG (electromyography) is a test used to measure the electrical activity of a patient's muscles. NCV (nerve conduction velocity), on the other hand, measures the intensity and the speed of the electrical signals that travel along the nerves, in addition to the reaction time for a response to these signals.