In fact, the Earth is farthest from the sun in July and is closest to the sun in January!During the summer, the sun’s rays hit the Earth at a steep angle. Thanks for asking, Answer 2: So you know that the sun is really hot, but space is really cold. Member exclusive by Gideon Lichfield Apparently, this is a question people ask, and they don’t like it when you make fun of them. Space; Why is the sun cold in the winter? The Earth-Sun distance will be 147,093,602 km. The reason is obvious: sunlight contains energy, and in near-Earth space, there is no atmosphere to filter that energy, so it’s even more intense than it is down here. If you’re thinking of sending spacecraft up there, let alone people, you need to know the answer. Take the Moon, which has virtually no atmosphere to complicate things. “The column of air pushing down on your head is shorter. You also need to know the answer if you want to carry out low-temperature physics experiments in space precisely because you think it is that cold. Why is space so cold if the sun is so hot? You are not always closer to the sun just because you're in space... actually most of space is much farther from our sun than the earth. Not colder as in lower temperature, but colder meaning it would have a …
On its own it could reach 8K (–265C/–445F), but with all the other experimental components around it, all radiating heat, it reaches 16K (–257C/–430F). Since the temperature of the Earth is so much hotter than space, you’d expect that the closer you get to space the colder it gets. Putting it all on a spacecraft would be about as close to perfect isolation from the environment as one can imagine.But now Kaltenbaek and colleagues, in collaboration with researchers at leading European space-technology company Astrium Satellites in Friedrichshafen, Germany, have worked out just how cold the apparatus could really get.
More Space. But one of the favourite explanations invokes an idea called decoherence, which means that in effect the quantum behaviour of a system gets jumbled and ultimately erased because of the disruptive effects of the environment. For objects large enough to see, containing countless trillions of atoms, decoherence happens in an instant, washing out quantum effects in favour of classical behaviour.In this picture, it should be possible to preserve “quantum-ness” in any system, no matter how big, if you could isolate it perfectly from its environment. Thus, we have winter! Our Mac Truck will probably be tumbling so neither side will have enough time to fully heat up or cool down. The problem is that the Sun doesn't work that way. The reason outer space is so cold is because cold is what you get when there is no source of heat nearby.At our distance from the sun, if you put, say, a Mac Truck in space, the side facing the sun will quickly get hot enough to burn you. The apparatus would have to be very cold because, as with most quantum effects, heat would disrupt a delicate superposition. How cold is it in space? Many people believe that the temperature changes because the Earth is closer to the sun in summer and farther from the sun in winter. As gases expand, they get cold, so the air gets very, very cold. The light does not spread out as much, thus increasing the amount of energy hitting any given spot. The photosphere, as the solar surface is called, is indeed pretty hot, between 6,700 and 11,000 degrees Fahrenheit (3,700 to 6,200 degrees Celsius).
The bigger question, of course, is whether anyone will consider MAQRO – a cheap experiment as space science goes – worth a shot.
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