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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...

Stars aren't supposed to come back to life after the death throes of the supernova stage, but astronomers have spotted three that have done just that – surviving the catastrophic explosion that usually marks the end of a star's life, and heading off through the galaxy on a new adventure. These peculiar 'zombie' stars move a lot faster than the undead humans you might be familiar with from film and TV, and astronomers think they might be a completely new class of star. Zombie stars like these are rare but not unheard of: another similar cosmic object, called LP 40-365, was spotted back in 2017. The three new zombie stars highlighted in a newly published study seem to have a lot in common with LP 40-365, including their relatively large size but relatively low mass. "Our new observations strongly support the interpretation that the new stars, like LP 40-365, are the partly burnt white dwarf accretors that survived disruption from a thermonuclear supernova in a si...

The sun is a star, just like the thousands of others we see in the sky each night. But it looks so very big. Is it the biggest star? No. The only reason the sun appears so big is because it is closer to us than any other star. The sun is just 93,000,000 miles (or 14,88,000,000 km) away from the earth. That seems an awful lot of distance, but light can travel so quickly that the sun’s rays reach the earth in a little more than eight minutes! That is the wonder of light. Many of the stars that we see at night, are more than 1000 times farther away than the sun. Obviously, this means that their light, too, would take 1000 times more time to reach the earth. And most stars are so far away that their light takes hundreds or even thousands of years to reach us. The distance travelled by light in a year, is called a light year (for those who have a head for figures, one light year is 58,780,000,000,000,000 miles).

When a ray of light travels from one medium to another it ‘bends’. This phenomenon is referred to as refraction. If it travels from a rare medium to a dense medium, it bends towards the normal and if it travels from a dense medium to a rarer medium, it bends away from the normal. The speed at which the light travels changes depending on the medium and therefore this bending occurs.

Hii , welcome to my post . Today we are going to know about Venus (planet). So let's start : Definition:  • Venus is the second planet from the Sun . • It is sometimes called Earth's "sister" or "twin" planet. • It is almost as large and has a similar composition   like  Earth.  • As an interior planet to Earth , Venus (like Mercury )    appears in Earth's sky, either as morning  Star or   evening star. • Aside from the Sun and Moon , Venus is the brightest   natural object in Earth's sky. • It is capable of casting visible shadows on Earth at   dark conditions. • It is being visible to the naked eye in broad daylight. • Venus is one of the four inner terresterial planets.  Facts : • Venus was the first planet explored by a spacecraft. • It was intensely studied early in the history of space   exploration. • Venus was also the first planet whose surface was    reached by a spacecraft from Eart...

Hii , welcome to my post . Today we are going to know about Mercruy (planet). So let's start : Definition : • Mercury is the smallest planet in the  Solar system   and the closest to the Sun . • Its orbit around the Sun takes 87.97 Earth days, the   shortest of all the Sun's planets. • It is named after the Roman god Mercurius (Mercury),   god of commerce, messenger of the gods, and   mediator between gods and mortals, corresponding   to the Greek god Hermes. • Like Venus , Mercury orbits the Sun within Earth 's     orbit as an inferior planet. • Its apparent distance from the Sun as viewed from   Earth never exceeds 28°.  • This proximity to the Sun means the planet can only    be seen near the western horizon after sunset. Facts :  • Mercury rotates in solar system in unique way.  • Mercury is the planet that orbits the closest to the    Sun.  • Mercury is the smallest pla...

Hii, welcome to my post . Today we are going to know about sun. So let's get started.   Definition: • The Sun is a star at the center of the Solar System,     about which planets of the solar system revolve. • It is a nearly perfect ball of hot plasma. • The Sun's radius is about 695,000 kilometers . • Sun is 109 times bigger than the Earth. • Its mass is about 330000 times that of Earth. • The Sun comprises  about 99.86% of the total mass. Facts: • The sun is a yellow dwarf star in the center of the   solar system. • It is the largest, brightest and most massive object in   the system. • The sun formed around 4.5 billion years ago. • The heat and light from this nuclear reaction enabled    life on Earth to evolve and prosper. Quick facts :   (i) Equatorial diameter ----- 1.39 M KM. (ii) Mass ---- 1.99 x 10 ³⁰ KG . (iii) Gal. Centre distance ---- 26038 light year . (iv) Roatationa...

 Hii , welcome to my post. Today we are going to know about solar system. So let's start. • The Solar System is the gravitationally bound system of the Sun and the objects that orbit it. • It formed 4.6 billion years ago from the   gravitational collapse of a giant interstellar           molecular cloud.  •Formation of solar system is described by bing bang theory . • Solar system consist of 8 planets . Before 2006 there were 9 planets in the solar system, but in 2006 the ninth planet "Pluto" was removed from our solar system.   • The order of the planets in the solar system,               starting nearest the sun and working outward is       the following: Mercury , Venus , Earth Mars ,                  Jupiter , Saturn , Uranus , Neptune and then the           possible Planet Nine Plu...