We know there is an absolute zero temperature, but is there an absolute maximum? A temperature beyond which things can get no hotter?
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If there were a large object, say a meteorite falling straight down where I'm standing, what kind of warning would I notice? Would there be an accompanying sound that could warn people on the ground? Or would I not know until it's too late?
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Lasers are the favourite weapons of the fictional supervillian, whether torturing spies or vaporising whole planets. But which fictional laser was closest to the truth?
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Could we set up a brewery in orbit, to keep the astronauts refreshed? Is there any reason we couldn't brew beer in zero gravity?
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We're told to save electricity by switching off devices on standby. If a home is heated solely by electricity, would there still be any savings by turning off all those devices?
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Why couldn't I focus on a reflection when close to the mirror?
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Do astronauts need a full 1G to remain in tip top health? Could we gat away with less, and if so, what's the minimum gravity required to keep astronauts healthy?
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If it takes a very massive star collapsing to form a black hole, and Hawking's radiation eats it away, then why doesn't it blow up after enough matter is eaten away?
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Solar sails could allow spacecraft to "sail" on sunlight - but if light has no mass, how do they work?
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Will a bubbly bath stay warmer for longer? What else can I do to keep my bath at the perfect temperature?
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Why do commercial airplanes land from flights with cold icy surfaces, while some supersonic jets and reentering spacecraft land with a hot surface due to atmospheric friction?
At what speed does windchill give way to frictional heating?
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Where on the Earth would you experience the strongest and weakest gravity?
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When you look at distant object like stars, the brightness will be controlled by two factors one the luminosity, and the other is the distance. So how can you determine the distance?
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Why don't potato peelers need sharpening, when all other knives need regular attention to avoid becoming blunt?
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How fast do I have to go to be lifted off the ground?
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If light has no mass, and gravity is a property of mass - then how is light bent by gravity?
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The universe is expanding at an ever-increasing rate. a) How fast is that now? b) Presumably the limit will be the speed of light - what will happen then? Will the rate of acceleration slow down as we approach the speed of light or just suddenly stop? Will the universe begin to contract after that or just keep on expanding?
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How many more hours of light would you get if you were sitting at the top of Mount Everest compared to someone at the same latitude, sitting at sea level?
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When there is a new moon in England , is the moon in Australia the same or because this country is on the other side of the world from us, is the moon either a day earlier or a day later, quite full?
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How can something appear to roll uphill?
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