Since childhood days we all have been told the stories of time and travel and magic through cartoons and storybooks. But is it really possible in the practical world? Yes, it is. Whether waiting for the favorite next episode to arrive or hoping to have more time to spend a day with a close one who resides in a different city, time always moves at a constant speed.
No one has ever actually accomplished exactly the sort of back-and-forth time travel seen in science fiction or proposed a way to send a person through a significant amount of time without killing them in the process, despite the fact that many people find the idea of altering the past or seeing the future before it happens to be fascinating.
But there is some evidence that supports some degree of temporal dilation. For instance, the special relativity theory of physicist Albert Einstein postulates that time is an illusion that shifts with respect to the observer. When compared to an observer at rest, an observer moving close to the speed of light will perceive time and all of its consequences like aging much slowly.
Other strange science ideas based on wormholes, black holes, and theoretical physics are among the scientific hypotheses concerning time travel. But for the most part, time travel continues to be the subject of a wide range of science fiction publications and media resources.
In 1905, Einstein created his special relativity theory. It has evolved into one of the pillars of modern physics together with his subsequent development, the theory of general relativity. According to special relativity, when an item is traveling in a straight line at a constant speed, space and time are related.The idea is deceptively straightforward in its condensed form. There is no “absolute” point of reference since everything is measured in respect to something else. Second, light travels at a constant pace. No matter what or where it is assessed from, it remains constant. Third, nothing travels at a quicker rate than light.
A number of scientific enquirers suggest our universe may be one in a collection of other universes, possibly an infinite number of universes spreading through other dimensions of time and space. Although these ideas are speculative at the moment, the large Hadron Collider in Switzerland is searching for evidence of multiple dimensions. And ESA’s Planck satellite will be looking for the evidence of inflation. if either finds it is looking for, the possibility of multiple universes will become stronger. The new theory postulates that, just after the creation of the universe, space expanded hugely, driven by fluctuations in energy that once they began were rather had to stop. Not only did our universe grow, but so did countless others in a chain reaction that continues to this day. These other universes would bud off from our own and be completely observable to us. they would bud new ones, creating an endless cascade. The idea of multiple universes crops us again in theoretical efforts to understand why we exist. It also points to how the forces of nature are related to one another, suggesting that reality may consists of 11 dimensions, not just the three that are familiar.
How old is the Universe?
According to the best measurements ever taken of the radiation left over from just after the Big Bang, the universe is a little older and perhaps a bit stronger than previously thought.the data from the Planck satellite combined a map of the remnant glow that largely affirms scientists theories about the universe’s early history. but the results also reveal a few quirks. Launched by the European Space Agency in 2009, the Planck satellite scans the sky for the cosmic microwave background, radiation that dates back to about 380,000 years after the Big Bang. That radiation was originally about 2,700 degree Celsius but has cooled to a mere 2.7 degrees above absolute zero. Planck is essentially a supersentitive thermometer that can probe the temperature of this radiation to millionths of a degree. that extraordinary precision allowed researchers to map tiny temperature fluctuations in the radiations across the entire sky. Now, that cosmologists do have access to the map, they can make many conclusions about how the universe has evolved
Dark Matter Mystery
Most of the universe is made up of dark energy, a mysterious force that drives the accelerating expansion of he universe. the next largest ingredient is dark matter, which only interacts with the rest of the universe through its gravity. normal matter, including all the visible stars, planets and galaxies, makes up less than 5% of the total mass of the universe. Astronomers cannot see dark mater directly, but can study its effects. They cans see lights bent from the gravity of invisible objects (called gravitational lensing). they can also measure that stars are orbiting around in their galaxies faster than they should be. This can all be accounted for if there were a large amount of invisible matter tied upon each galaxy, contributing to its overall mass and rotation rate.
What Exactly it is ?
Astronomers know more about what dark matter is not than what is is. Dark matter is dark: It emits no light and cannot be seen directly, so it cannot be stars or planets. Dark matter is not clouds of normal matter , normal matter particles are called baryon. If dark matter were composed of baryons. it would be detectable through reflected light. Dark matter is not antimatter: Antimatter annihilates matter on contact, producing gamma rays. Astronomers do not detect them. Dark matter is not black holes : Black holes are gravity lenses that bend light. Astronomers do not see enough lensing events to accounts of dark matter that must exist. Particle colliders such as the large Hadron Collider. Cosmology instruments such as WMAP and Planck. Direct detection experiments including CDMS, XENON, Zeplin, WARP, ArDM and others. Indirect detection experiments including; Gama ray detectors (Fermi from space and Cherenkov telescopes from the ground ); neutrino telescopes (IceCubes, Antares); antimatter detectors( Pamela, AMS-02) and X-ray and radio facilities.