Why do we need to measure speed ? we need to measure speed because it helps to calculate the constant speed of an object.

In science and physics the standard unit of measure for speed is generally meters per second or m/s. Average Speed – The average speed is calculated by the distance that an object traveled over a given interval of time. If a car traveled 50 miles over the course of one hour then its average speed will be 50 mph.

Faster-Than-Light Travel Is Possible Within Einstein’s Physics, Astrophysicist Shows. Within conventional physics, in accordance with Albert Einstein’s theories of relativity, there’s no real way to reach or exceed the speed of light, which is something we’d need for any journey measured in light-years.

Special relativity states that nothing can go faster than the speed of light. If something were to exceed this limit, it would move backward in time, according to the theory.

The speed of light as it travels through air and space is much faster than that of sound; it travels at 300 million meters per second or 273,400 miles per hour.

They are most certainly not hospitable and would make traveling into the black hole extremely dangerous. To enter one safely, you would need to find a supermassive black hole that is completely isolated and not feeding on surrounding material, gas, and or even stars.

Time freezes at the event horizon and gravity becomes infinite at the singularity. The good news about massive black holes is that you could survive falling into one. Although their gravity is stronger, the stretching force is weaker than it would be with a small black hole and it would not kill you.

Near a black hole, the slowing of time is extreme. From the viewpoint of an observer outside the black hole, time stops. According to Einstein’s theory, time and space, in a way, trade places inside the hole. Inside the black hole, the flow of time itself draws falling objects into the center of the black hole.

It is possible for two black holes to collide. Once they come so close that they cannot escape each other’s gravity, they will merge to become one bigger black hole. However, we do know that a black hole merger would produce tremendous energy and send massive ripples through the space-time fabric of the Universe.

In 1939 he published a paper that argues that a star collapsing would spin faster and faster, spinning at the speed of light with infinite energy well before the point where it is about to collapse into a Schwarzchild singularity, or black hole.

Einstein’s Theory of General Relativity Proven Right Again by Star Orbiting Supermassive Black Hole. Its orbit is shaped like a rosette and not like an ellipse as predicted by Newton’s theory of gravity.

General relativity has also been confirmed many times, the classic experiments being the perihelion precession of Mercury’s orbit, the deflection of light by the Sun, and the gravitational redshift of light. Other tests confirmed the equivalence principle and frame dragging.

Black holes were first identified in Einstein’s general relativity.

Einstein

Objects whose gravitational fields are too strong for light to escape were first considered in the 18th century by John Michell and Pierre-Simon Laplace.

British astronomers Louise Webster and Paul Murdin at the Royal Greenwich Observatory and Thomas Bolton, a student at the University of Toronto, independently announced the discovery of a massive but invisible object in orbit around a blue star over 6,000 light-years away.

Astronomers saw the first signs of the black hole in 1964 via gas it sucked away from a closely orbiting blue supergiant star. As this gas spiraled into the black hole, it became so hot it emitted high-energy X-rays and gamma-rays that satellites could detect.

Cygnus X-1

Black holes swirling with stars But the majority of black holes in our galaxy are invisible, so the only way to find them is by observing their gravitational effects on surrounding objects. The astronomers studying HR 6819 weren’t looking for black holes at all.