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- 2048 - Learning facts about space. Our Milky Way galaxy contains up to 400 billion stars. In the observable universe, there are more than 200 billion galaxies Blackholes form when massive stars collapse into themselves and condense their mass into an unbelievably small area. Launched on 5 September 1977, space probe Voyager 1 is now the furthest man-made object from Earth, at 11,136,538,637 miles away. There is a lot more to learn.
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------------------------ 2048 - Learning facts about space.
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- Our Milky Way galaxy contains up to 400 billion stars. In the observable universe, there are more than 200 billion galaxies (some estimates put this figure at up to 500 billion) – each with billions or even trillions of stars within it.
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- This equates to roughly 100,000,000,000,000,000,000,000,000,000 stars in the observable universe. Of the planets orbiting these stars, astronomers estimate that there are 50,000,000,000,000,000,000,000 (50 sextillion) habitable planets.
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- This is in the “observable universe“, so the real figures may be infinite… Still wondering whether extraterrestrial life is likely to exist?
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- Many scientists believe that there are an infinite number of parallel universes that exist alongside our own in other dimensions, not just the four that we are used to. This theory would explain some of the peculiarities of quantum mechanics. Detecting a parallel universe is one of the aspirations of the team of scientists working on the CERN Hadron Collider in Switzerland.
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- What is space weather like? Solar winds and interstellar gas clouds can reach millions of degrees in temperature. But, the general background temperature of outer space is around -260C.
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- The closest galaxy to our own is Andromeda Galaxy. Measuring 140,000 light years across and 2.5 million light years away from Earth, if it were bright enough to be seen in the night sky, it would appear six times as large as the Moon. On a clear night you can just make it out in the northeast horizon. The Milky Way Galaxy is 100,000 lightyears across.
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- Blackholes form when massive stars collapse into themselves and condense their mass into an unbelievably small area. The tiniest are called primordial black holes. These are thought to be the size of an atom, but with the mass of a mountain! The biggest are supermassive blackholes. They have masses greater than 1,000,000 Suns.
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- It’s thought that every galaxy has a supermassive blackhole at its center. The Milky Way’s is called Sagittarius A. It has a mass equal to 4,000,000 Suns – yet it would fit inside the circumference of our own Sun. It was discovered by measuring the velocity of several stars orbiting a spot of nothing we can see. If a human were to become a black hole, that person would have to be compressed to the size of a proton.
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- It’s thought that, over the course of a year, 100 billion stars are born and die throughout the universe.
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- Astronauts returning from space have said that their spacesuits and gear smell like seared steak and hot metal. This odor is probably caused by the remnants of dying stars.
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- Back in the days when you’d turn your TV over to a badly tuned channel, the static, or ‘white noise’ you heard was made up of about one per cent radiation left over from the Big Bang. The proper name for this is Cosmic Microwave Background Radiation.
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- Space officially begins 62 miles above the Earth, at the Karman line.
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- Launched on 5 September 1977, space probe Voyager 1 is now the furthest man-made object from earth, at 11,136,538,637 miles away. In 1990, it took the first ever image of our solar system from the ‘outside’ , showing the Earth as a tiny blue dot.
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- Neutron stars are a crushed core of a massive star with a small radius and extremely high density. Neutron stars can spin at up to 43,000 times a minute, and have a magnetic field one trillion times stronger than Earth. They are one of the densest objects known. One teaspoon of matter from a neutron star would weigh as much as one billion tons.
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- Space is completely silent. Sound needs an atmosphere to travel through, and since space has no atmosphere, it has no sound. The biggest, most awe-inspiring exploding star wouldn’t even make a peep. Astronauts are able to communicate in space using radio waves, which are electromagnetic waves that can travel through space. Light and radio are both electromagnetic waves, with radio having much longer wavelengths.
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- Because the Moon does not have an atmosphere either the footprints made by the Apollo astronauts are likely to remain printed on the lunar surface for billions of years.
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- Space is almost a perfect vacuum. As a result, if two lumps of the same metal touch each other, they’ll meld together. This is because the atoms in each piece of material have no air separating them, so the lumps of metal have no way of knowing they’re two different pieces. Imagine the possibilities of construction in space with this handy effect!
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- Space is not nothing. There is a lot more to learn.
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------------------------- Monday, April 2, 2018 --------------------------------
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