![]() The coldest of all is the Boomerang Nebula, a cloud of dust and gas 30 million billion miles away from us. While these planets in our Solar System are incredibly cold, there are even chillier places in the universe. This information lets us know exactly what the temperature of the planet is: the atoms and molecules act as a kind of temperature “fingerprint” for the planet. We do this by studying the light from the planet, which can tell us the types of atoms and molecules which make up the planet’s atmosphere. Instead, we have to work out how cold they are by measuring their temperature from here on Earth. However, we haven’t been able to do this for distant planets such as Neptune and Uranus. Because it does not have this blanket, the front side and the back side of Mercury can have very different temperatures.įor some nearby planets like Mars, we can send probes to study the atmosphere directly from the planet’s surface. An atmosphere like ours acts like a blanket, holding heat in and spreading it all around. ![]() The reason for this is that Mercury does not have any atmosphere, unlike Earth. While the side of Mercury facing the Sun is more than 400℃, the side facing away from the Sun is nearly -200℃. You might also be surprised to learn that the closest planet to the Sun, Mercury, can also be extremely cold. Neptune wasn’t hit by a huge asteroid like Uranus was, so it has been able to hold on to more of its heat. If you clap your hands together for a long time they will start to feel hot – the same thing happens with planets. Every time these rocks smash together, the planet gains a little more heat. Planets are made when smaller chunks of rock smash together, building the full planet piece by piece over many millions of years. The heat inside planets is left over from when they were formed. The impact of the crash also let some of the heat that was trapped inside Uranus escape. Uranus still rolls around the Sun on its side today. Billions of years ago, something big crashed into Uranus with so much force that it tipped the planet over onto its side. The reason why Uranus is so cold is nothing to do with its distance from the Sun. The temperature on Neptune is still very cold, of course – usually around -214℃ – but Uranus beats that. Uranus holds the record for the coldest temperature ever measured in the Solar System: a very chilly -224℃. However, the coldest planet is not Neptune, but Uranus – even though Uranus is a billion miles closer to the Sun than Neptune. Neptune is an incredible three billion miles away from the Sun. You might think, then, that the coldest planet in the Solar System would be Neptune, as it is the furthest away from the Sun’s warmth. Here on Earth, we are about 100 million miles away from the Sun – a distance that provides the perfect temperature for life. The planets in our Solar System are heated by the Sun. On the impact of higher local temperatures, MSS said: "Members of the public can protect themselves against the heat by taking measures such as wearing lightweight clothing, staying hydrated, using sunscreen and staying in the shade where possible while outdoors.What is the coldest planet in the Solar System? – Sejal, aged seven, Bangalore, India Giving this projection on Monday (May 9), the World Meteorological Organisation said the threshold is expected to be crossed more frequently as global temperatures rise. That is the global heating limit set by governments and scientists as the ceiling to avoid catastrophic climate change. This heat is expected to intensify within the next five years as the world faces a nearly 50 per cent chance of briefly reaching 1.5 deg C above pre-industrial levels. National University of Singapore professor of urban climatology Matthias Roth said: "Generally, we have to get used to increasing air temperatures here and elsewhere due to anthropogenic global warming, which sets the background conditions, and urbanisation which produces additional local warming."
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