sciencewr.com

# Speed Of Light Chased Gravity

First Posted: Nov 25, 2016 04:10 AM EST
Close

Do you ever wonder how was the first ever movement of the universe? With all speculations thrown by lots of conjecture, for sure everyone is puzzled as how the universe began its first motion.

Several articles were released recently, questioning does gravity travel at the speed of light? Well, the truth has yet to come.

To start with, gravity is defined by Isaac Newton that every other particle in the universe uses forces that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. In the modern language, every point mass attracts every single other point's mass by a force pointing along the line intersecting both points.

However, this theory was examined by the renowned scientist named Albert Einstein. In fact, according to him, the velocity of light appears to vary with the intensity of the gravitational field -- a theory that was developed and called the general relativity that deals with gravitational fields.

Einstein theorized that the measured speed of light in a gravitational field is actually not constant but rather a variable depending upon the reference frame of the observer.

As he worked out the equations for his general theory of relativity, Einstein realized that massive objects caused a distortion in space-time. Imagine setting a large body in the center of a trampoline. The body would press down into the fabric, causing it to dimple. A marble rolled around the edge would spiral inward toward the body, pulled in much the same way that the gravity of a planet pulls at rocks in space, Space.com reported.

To understand way better this enigmatic approach, Forbes noted that, "If you looked out at the Sun across the 93 million miles space that separate our world from our nearest star, the light you're seeing is not from the Sun as it is right now, but rather as it was some 8 minutes and 20 seconds ago. This is because as fast as light is moving at the speed of light which is not instantaneous. It requires that length of time to travel from the Sun's photosphere to our planet."

Newton's second law thought the influence of gravity was instantaneous. However, Einstein assumed it traveled at the speed of light -- the general relativity. New Scientist reported that light-speed gravity implies that if the Sun suddenly vanished from the center of the Solar System, the planet Earth would remain circulating in the orbit for 8.3 minutes -- the time it takes light to travel from the Sun to the Earth. Then, suddenly loss of gravity and Earth would discharge to its orbit directing in a straight line.