Relativity. Of light and time…. Light takes a certain amount of time to travel from an object/ event to us…. The further away something is, the greater that amount of time is Sooo … We look at stars…. We see the past. Light year ( ly ) - distance that light travels in a year
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Speed of light (c) - 3.0 x 108 m/s
Or about 180,000 miles/sec
But what if we could travel on a beam of light….. ???
Einstein’s Laws Always right
Note- The travelling twin thinks his time is running normally… does not feel like his clock is “slow”
Δt - dilated time interval (Earth’s clock)
Δt’ - proper time interval (Spaceship’s clock)
*Notice that if v is close to c then Δt is large
*If v is small compared to c then Δt’ is approximately equal to Δt
Graph shows that time dilation is only significant at very high speeds… speeds approaching the speed of light!
Y axis – number of seconds past for stationary observer for every 1 second past for moving observer
X –axis -- Fraction of speed of light traveller is moving at
Decay of muons moving at a speed of 0.995c with respect to the observer
You and Jackie disagree on the simultaneity of the red and green light flashes
The path of the famous eclipse through South America
After this confirmation (over 3 years after GR was theorized) Einstein became an instant celebrity and world renowned scientist
Multiwavelength X-ray, infrared, and optical compilation image of Kepler's Supernova Remnant, SN 1604. ( Chandra X-ray Observatory)
This is a mosaic image, one of the largest ever taken by NASA's Hubble Space Telescope of the Crab Nebula, a six-light-year-wide expanding remnant of a star's supernova explosion. Japanese and Chinese astronomers recorded this violent event nearly 1,000 years ago in 1054, as did, almost certainly, Native Americans. Located at a distance of about 6,500 light-years (2 kpc) from Earth, the nebula has a diameter of 11 ly (3.4 pc) and is expanding at a rate of about 1,500 kilometers per second. At the centre of the nebula lies the Crab Pulsar, a rotating neutron star
Paths of stars orbiting around an empty point in space, once orbital data calculated the only object that could be causing objects to move like this is a black hole.
“empty” space objects are orbiting
An artists concept of a microquasar, like V404 Cygni. The black hole is stealing gas from a companion star (left). The gas forms a thin, hot disk (accretion disk) around the black hole. When enough gas builds up there is a bright flare-up of X-rays, and jets of charged particles squirt away at close to the speed of light. [ESA]
X-rays that can be detected
When this "fuel" is exhausted, there are three possible outcomes, depending on the total mass of the star: