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Over the years, people have developed very clever schemes to try and circumvent this last limit. Theoretically, they’ve introduced tachyons as hypothetical particles that could exceed the speed of light, but tachyons are required to have imaginary masses, and do not physically exist. Within General Relativity, sufficiently warped space could create alternative, shortened pathways over what light must traverse, but our physical Universe has no known wormholes. And while quantum entanglement can create “spooky” action at a distance, no information is ever transmitted faster than light. But there is one way to beat the speed of light: enter any medium other than a perfect vacuum. Here’s the physics of how it works. Light is nothing more than an electromagnetic wave, with in-phase oscillating fields. Light is nothing more than an electromagnetic[+] AND1MU / WIKIMEDIA COMMONS Light, you have to remember, is an electromagnetic wave. Sure, it also behaves as a particle, but when we’re talking...

huge solar eruption from bright sun on dark background All stars dies and our Sun is a star. Therefore, it makes sense that at some point down the line, our Sun, which provides life to Earth, will die, too. When it does, scientists say that the Sun will destroy Earth, Mercury, and Venus, leaving our entire solar system devastated. Earth in space One day, the Sun may destroy Earth or make it unlivable due to the intense heat and energy it releases. Image source: Tryfonov / Adobe A full pot can only boil so long before it finally boils over, and the Sun is kind of like a pot of water, just boiling away for billions of years. Right now, our star is still young, generating tons of energy and acting as a source of light and heat that helps keep Earth alive. But, one day, that same energy will cause the Sun to destroy Earth and other planets along with it. Meet Aqara: The Smarter, More Affordable Way To Secure Your Home Ad by AqaraSee More This isn’t a new idea. Scientists have estimated...

The discovery of nuclear fusion processes last century was the seed for a detailed picture of the evolution of a star from a protostellar gas cloud through extinction as a white dwarf or death in a supernova. A star’s mass largely determines its fate; chemical composition plays a smaller role. Stars with mass similar to the Sun will end up as white dwarfs — cores of carbon and oxygen with hydrogen- or helium-dominated atmospheres — after their outer layers of gas are lost as stellar superwinds. Ultraviolet radiation from the white dwarf ionizes the ejected gas, forming a planetary nebula. The white dwarf core can burn no additional fuel, and it gradually cools until it no longer emits heat or electromagnetic radiation in the visible spectrum. This stellar remnant is called a black dwarf. No black dwarf has been detected yet, as the cooling time that a white dwarf needs to reach this state is longer than the age of the universe. Stars of a few solar masses also end their life cycles as ...

At the beginning of your trip through space, you might recognize some of the sights. The Earth is part of a group of planets that all orbit the Sun – with some orbiting asteroids and comets mixed in, too. A diagram of the solar system, showing the sun and its orbiting planets. A familiar neighborhood. Mark Garlick/Science Photo Library via Getty Images You might know that the Sun is actually just an average star, and looks bigger and brighter than the other stars only because it is closer. To get to the next n hii earest star, you would have to travel through trillions of miles of space. If you could ride on the fastest space probe NASA has ever made, it would still take you thousands of years to get there. If stars are like houses, then galaxies are like cities full of houses. Scientists estimate there are 100 billion stars in Earth’s galaxy. If you could zoom out, way beyond Earth’s galaxy, those 100 billion stars would blend together – the way lights of city buildin...

The Universe is considered by some to be infinite, while others find comfort in the fact that it may have an end. Throughout the ages of space exploration, the only certain thing is maybe the fact that the Universe will never be charted. Why is this? It’s because of the endless galaxies that seem to pop out left and right, their sizes, distances, and other aspects. So how many galaxies are there in the Universe? Currently, the observable Universe, which has a radius of 46.5 billion light-years, seems to contain at least two trillion galaxies. Our galaxy, the Milky Way, is just one among these numerous galaxies, and it isn’t even considered a big galaxy. It stretches for 105,700 light-years in diameter and may contain at least 100 billion planets and around 400 billion stars. Now, if we were to imagine how many planets and stars those 2 trillion galaxies might have, we would probably have to throw out our calculators. This is especially true since some galaxies are several times larger ...

Jump to: Black hole discovery  How many black holes are there?  Black hole images  What do black holes look like?  Types of black holes  Black hole facts  Additional resources Black holes are some of the strangest and most fascinating objects in space. They're extremely dense, with such strong gravitational attraction that not even light can escape their grasp.  The Milky Way could contain over 100 million black holes, though detecting these gluttonous beasts is very difficult. At the heart of the Milky Way lies a supermassive black hole — Sagittarius A*. The colossal structure is about 4 million times the mass of the sun and lies approximately 26,000 light-years away from Earth, according to a statement from NASA(opens in new tab). The first image of a black hole was captured in 2019 by the Event Horizon Telescope (EHT) collaboration. The striking photo of the black hole at the center of the M87 galaxy 55 million light-years from Earth thrilled scient...