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Hear the Sun SingHave you ever wondered what the Sun would sound like if you could hear it? Our Sun lies 93,000,000 miles away, surrounded by the vacuum of space. Sound won't travel through space, of course. But with the right instrument, scientists can "hear" pulsations from the Sun. The entire Sun vibrates from a complex pattern of acoustical waves, much like a bell. If your eyes were sharp enough, you could see a bell's surface jiggle in complex patterns as the waves bounced around within it. Likewise, astronomers at Stanford University can record acoustical pressure waves in the Sun by carefully tracking movements on the Sun's surface. To do this, they use an instrument called a Michelson Doppler Imager (MDI), mounted on the SOHO spacecraft, circling the Sun 1,000,000 miles from Earth.
The visible pattern would be concentric ripples radiating from the source over the surface of the Earth. That could be fairly visible
NOAA Scientists Able to Measure Tsunami Height From Space [attachment=6028] After reviewing data from four Earth-orbiting radar satellites, NOAA scientists today announced they were able to measure the height of the devastating tsunami that erupted in the Indian Ocean. The ability to make depth surveys from space may lead to improvements in the models that forecast the hazardous effects of tsunamis. NOAA is an agency of the U.S. Department of Commerce. The height goes down over time as the wave spreads over the ocean and the energy is expended on shore. At 2 hours after the quake, it was 60 cm (about 2 feet) high. By 3 hours 15 minutes after the quake, that dropped to around 40 cm (about 16 inches) high. By 8 hours 50 minutes after the quake, the wave spread over most of the Indian Ocean and was quite small in most areas -- 5 to 10 cm (2 to 4 inches) -- about the limit of the satellite resolution.
The 1883 eruption ejected approximately 21 cubic kilometres of rock, ash, and pumice, and generated the loudest sound historically reported: the cataclysmic explosion was distinctly heard as far away as Perth in Australia approx. 1,930 miles (3,110 km), and the island of Rodrigues near Mauritius approx. 3,000 miles (5,000 km) distant. Smaller waves were recorded on tidal gauges as far away as the English Channel. These occurred too soon to be remnants of the initial tsunamis, and may have been caused by concussive air waves from the eruption. These air waves circled the globe several times and were still detectable using barographs five days later.
Let's say the explosion on a planet happens in a universe that does not have visable light