All about Universe

Satellite Launch Vehicles. A rocket-powered vehicle used to transport a spacecraft beyond Earth's atmosphere, either to orbit around Earth or to some other destination in outer space. In order to reach Earth orbit, a launch vehicle must accelerate its spacecraft payload to a minimum velocity of 28,000 km (17500 miles) per hour, which is roughly 25 times the speed of sound. To overcome Earth's gravity for  travel to destinations such as the Moon or Mars, the spacecraft must be accelerated to a velocity of approximately 40,000 km (25,000 miles) per hour. The initial acceleration must also be provided very rapidly in order to minimize both the time that a launch vehicle takes to transit the stressful environment of the atmosphere and the time during which the vehicle's rocket engines and other systems must operate near their performance limits; a launch from Earth's surface or atmosphere usually attains orbital velocity within 8 –12 minutes. Such rapid acceleration require...

What Is A Satellite?  A satellite is a moon, planet or machine that orbits planet or star. For example, Earth is a satellite because it orbits the Sun. Likewise the Moon is a satellite because it orbits Earth. Usually, the word "satellite" refers to a machine that is launched into space and moves around Earth or any other body in space. Earth and moon are examples of natural satellites. Thousands of artificial or man-made satellites orbit Earth. Some take pictures of the planets that help meteorologists predict wheather and track hurricanes. Some take pictures of other planets, the Sun, Black Holes, Dark Matter or faraway Galaxies. These pictures help scientists better understand the Solar System and Universe. Still other satellites are used mainly for communications, such as beaming TV signals and phone calls around the world. A group of more than 20 satellites make up the Global Positioning System, or GPS. If you have a GPS receiver, the satellites can help figure out your...

Outlined below are the many steps involved in a stars evolution, from its formation in nebula, to its death as a white dwarf or neutron star. NEBULA A Nebula is a cloud of gas(hydrogen) and dust in space. Nebulae are the birth places of stars. There are different types of nebula. An emission nebula e.g. such as Orion nebula, glows brightly because the gas in it is energized by the stars that have already formed within it. In a Reflection Nebula, starlight reflects on the grains of dust in a nebula. The nebula surrounding the Pleiades Cluster is typical of a reflection nebula. Dark Nebula also exist. These are dense clouds of molecular hydrogen which partially or completely absorb the light from the stars behind them e.g. the Horsehead nebula in Orion. Planetary Nebula are the outer layers of a star that are lost when the star changes from a red giant to a white dwarf.   Shop now at Amazon Pantry at best deals Amazon Pantry STAR A star is a luminous globe of gas producing its own he...

If The Black Holes Are "Black", How Do Scientists Know They Are There? A black hole cannot be seen because of the strong gravity that is pulling all of the light into the black hole's centre. However, scientists can see the effects of its strong gravity on the stars and gases around it. If a star is orbiting a certain point in space, scientist can study the star's motion to find out if it is orbiting a Black Hole. When a Black Hole and a star are orbiting close together, high-energy light is produced. Scientific instruments can see this high-energy light. A black hole's gravity can sometimes be strong enough to pull off the outer gases of the star and grow a disc around itself called the accretion disk. As gas from the accretion disk spirals into the black hole, the gas heats to very high temperatures and releases X-ray light in all directions. NASA telescopes measure the X-ray light. Astronomers use this information to learn more about the properties of a Black ...

  What is a Black Hole?  A black hole is a place in space where gravity pulls so much that even light cannot get out. The gravity is so strong because matter has been squeezed into a tiny space. This can happen when a star is dying. Because no light can get out people can't see black holes. They are invisible. Space telescopes with special tools can help find black holes. The special tools can see how stars that are very close to black holes act differently than other stars.  Different Types Of Black Holes. Black holes can come in a range of sizes, but there are three main types of black holes. The black hole's mass and size determine what kind it is. Black Holes are of following types: 1. Premordial Black Holes 2. Stellar 3. Super Massive Buy at best deals: Kitchen and home appliances   These Black Holes are explained below: 1. Premordial Black Holes The smallest ones are known as Premordial  Black Holes. Scientist believe this type of Black hole is as small as...

Space suits are required for astronauts to survive in space by protecting from dangers of space. Space Suits cost about $ 12 million (90 crore rupees). • Due to space being a vacuum, the suits are required to have oxygen. • Oxygen is stored in tanks allowing astronauts to work outside spacecraft for 6 to 8.5 hours. • Space suit also have water supply bags (620 to 950ml), so astronauts do not suffer dehydration.  • The space suit is made from several layers of material and there is a tubing all around which is filled with chilled water to help cool the suit. The suit is also insulated so the astronauts does not become too cold. The several layers also protect astronauts from harmful space radiations, space dust which can travel faster than a bullet.  • The visors on the suit helmets are made with a special gold lines which protects the eyes of the astronauts from sunlight.  In hard times of Covid19 keep masks on your face, to buy masks click here:   Masks How long Can...

Here are some other difficulties that Astronauts deals with in Space: What Causes Muscle Atrophy and Loss Of Mass? Muscle atrophy is defined as a decrease in the mass of the muscle; it can be a partial or complete wasting away of muscle, and is most commonly experienced when persons suffer temporary disabling circumstances such as being restricted in movement or confined to bed as when hospitalized. To produce muscle growth, we have to apply stress greater than what your body or muscles were previously adapted to. Muscular tension also affects the connection of the motor units with the muscle cells. After workout, our body repairs or replaces the damaged muscle fibres. Muscle fibres are fused together to form New muscle protein strands for myofibrils. These repaired myofibrils increased thickness as well as number to create muscle hypertrophy. Thus muscle growth occurs whenever the rate of muscle protein synthesis is greater than the rate of muscle protein breakdown. This adoptions, ho...

Humans are psychologically well adapted to the life on Earth. On moving apart from the Earth gravity reduces so we face microgravity or weightlessness. Weightlessness is not due to zero gravity, it is due to absence of stress and strains. It is a uniform gravitational field that withdraw any stress or strain that may certainly be present due to variable and mechanical contact forces E.g. force exerted by floor, seats , scales etc, anything that have mass. Gravity due to rest of the milky way is already very less so we do not need to move so far from the Earth's centre to feel weightlessness, it could be felt on moon with a small jump and even in spacecraft by creating microgravity. Adversities caused by Weightlessness. 1. Balance Disorders 2. Eyesight Disorders 3. Muscle atrophy and loss of mass 4. Spacecraft osteopenia 5. Decreased RBC production 6. Weakening of Immune system 7. Slowing of Cardiovascular functioning 8. Space sickness 9. Excess flatulence  10. Sleep disturbance. S...

 What is Microgravity? Microgravity is the condition in which people or objects appear to be weightless. The effects of microgravity can be seen when astronauts and objects float in space. Microgravity can be experienced in other ways, as well. " Micro " means " very small ", so microgravity refers to the condition when gravity seems to be very small. In microgravity , astronauts can float in their spacecraft - or outside, on a spacewalk. Heavy objects move around easily. For example, astronauts can move equipments weighing hundreds of pounds with their fingertips. Microgravity is sometimes called "zero gravity", but this is misleading. Why does NASA Study Microgravity ? NASA studies microgravity to learn what happens to people and equipment in space. Microgravity effects the human body in several ways. For example, muscles and bones can become weaker without gravity making them work as hard. Astronauts who live on the Space station spend months in mi...

Matter as we all know it; stars and galaxies, planets and trees, rocks and us. This matter accounts for less than 5% of the known Universe. About 25% is Dark matter ; and 70% is Dark energy . Both of which are invisible. This is kind of strange because it suggests that everything we experience is really only a tiny fraction of reality. But it gets worse. We really have no clue what Dark Matter and Dark Energy are, or how they work. We are pretty sure there exist though. So, what do we know?  Dark matter is the stuff that makes it possible for galaxies to exist. When we calculated why the Universe is structured the way it is, it quickly became clear that there is not just enough normal matter. The gravity of the visible matter is not strong enough to form galaxies and complex structures. The stars would more likely be scattered all over the place and not form galaxies. So we know there something else inside and around them. Something that doesn't emit or reflect light. Something ...

General relativity postulates that the Big Bang would have begun Time because, in a singularity state (like what the Universe just before the Big Bang), there was no time. Rhe relativity of time and its consequences is by far one of rhe most difficult concepts for the scientific layman to grasp.  Most people say that they know time is relative, but they have no idea what that implies for the early Universe. For stop the relativity of time means that there was no "before" the Big Bang. Time is not a straight line concept. Time on the sun passes at a different rate than it does here on Earth due to the difference in the gravitational disturbance that it creates. There is a reason why we call it "space-time". According to Newton, time is absolute means that for everyone, anywhere in the universe value of time is equal. While according to Einstein Space and Time are interconnected. There is no "Absolute Time". In other words there is no "correct" tim...

 AROUND 13.8 BILLION YEARS AGO  The Universe was in a singularity condition "before" the Big Bang (notice the quotes), meaning that it was infinitesimally small. All distance separations were zero, meaning that there was no space. Since there was no space in the Universe's singularity condition, it is impossible to accurately express how small it was.  As a consequence of the absence of space, there was no time, either. This expansion automatically gets its name as the "Big Bang" because of its vastness. After that , many things came into existence like the protons neutrons stars galaxies gaseous material Milky Way and even our Earth. Shop Now Giant clouds of these elements mainly consists of the gases like Hydrogen, Helium, Lithium which together later formed the early galaxies and stars. No one really knows what caused the explosion, but that's certainly no reason to differ to some sort of divine intervention. The early Universe could have existed as a ver...