Located in the Coma Cluster, about 300 million light years away from Earth, the orb is actually a distant view of the giant elliptical galaxy NGC 4889. At the center of that galaxy lies a sleeping giant: a supermassive black hole that is 21 billion times the mass of our sun. The size of a black hole can be estimated by its event horizon, or the distance from the center of the black hole at which nothing can escape its gravitational grasp.
Do not do this! Muriatic acid is used to profile concrete by breaking down the top coat of the surface for epoxy coatings and sealers. If used to remove oil stains you will still have oil underneath and a weakened concrete surface that will look different than the rest of the garage floor.
1 Tung oil should be applied to concrete countertops about once a year. 2  Test the concrete by dropping water onto it. 3  If it beads, the concrete does not need another application of tung oil. 4  If the water absorbs into the concrete, it is time for another application. 5  Use dark tung oil when sealing concrete countertops.