Pilot holes help prevent that. Pilot holes are drilled into a piece of material before fastening that material with a screw. There are a few reasons why it's smart to drill a pilot hole.
“It’s a big old black hole.” It’s not yet clear exactly who was flying, but if the pilot at the controls was instrument-rated, as Safai was, they would have been qualified to fly just by ...
You’ll need two to drill larger holes: a smaller bit for drilling a pilot hole and a larger one that’s the recommended size to finish the job. As you position the object on the wall and lay ...
NASA's Chandra X-ray telescope peers at a jet blasting forth from the central supermassive black hole of Centaurus A, a galaxy 12 million light-years from Earth. Credit: D. Bogensberger et al.