- Can we go back in time?
- How many dimensions do we live in?
- Who said time is an illusion?
- Can we go back in time if we travel faster than light?
- Will we ever travel at light speed?
- What does it mean to bend time?
- How is space bent?
- Does time exist in a black hole?
- What does E mc2 mean?
- How many dimensions are there?
- Does weight change in space?
- Can wormholes exist naturally?
- Can a black hole die?
- Is there anything inside a black hole?
- Is time an illusion?
- Is time a real thing?
- Do wormholes exist?
- Can a time machine be made?
Can we go back in time?
Time travel to the past is theoretically possible in certain general relativity spacetime geometries that permit traveling faster than the speed of light, such as cosmic strings, traversable wormholes, and Alcubierre drives..
How many dimensions do we live in?
In everyday life, we inhabit a space of three dimensions – a vast ‘cupboard’ with height, width and depth, well known for centuries. Less obviously, we can consider time as an additional, fourth dimension, as Einstein famously revealed.
Who said time is an illusion?
EinsteinThe idea that that – as you quoted Einstein, the distinction between the past, present and the future is an illusion, this comes from very well-understood physics, in Einstein’s case general theory of relativity. But these ideas have been prevalent since Newton’s physics in the late 1600s.
Can we go back in time if we travel faster than light?
But to achieve true backward time travel, we’ll have to go even faster! … So, simply going faster than light does not inherently lead to backwards time travel. Very specific conditions must be met—and, of course, the speed of light remains the maximum speed of anything with mass.
Will we ever travel at light speed?
So will it ever be possible for us to travel at light speed? Based on our current understanding of physics and the limits of the natural world, the answer, sadly, is no. … So, light-speed travel and faster-than-light travel are physical impossibilities, especially for anything with mass, such as spacecraft and humans.
What does it mean to bend time?
To bend time means to travel from one point to another on the space-time continuum. which means moving through time and space.
How is space bent?
Large objects such as the Sun and planets aren’t the only masses that warp the fabric of space-time. Anything with mass—including your body—bends this four-dimensional cosmic grid. The warp, in turn, creates the effect of gravity, redirecting the path of objects that travel into it.
Does time exist in a black hole?
Near a black hole, the slowing of time is extreme. From the viewpoint of an observer outside the black hole, time stops. For example, an object falling into the hole would appear frozen in time at the edge of the hole.
What does E mc2 mean?
“Energy equals mass times the speed of light squared.” On the most basic level, the equation says that energy and mass (matter) are interchangeable; they are different forms of the same thing.
How many dimensions are there?
The world as we know it has three dimensions of space—length, width and depth—and one dimension of time. But there’s the mind-bending possibility that many more dimensions exist out there. According to string theory, one of the leading physics model of the last half century, the universe operates with 10 dimensions.
Does weight change in space?
In space without gravity pulling down on them, Astronauts are essentially weightless. It is important to explore the difference between mass and weight. While Astronauts may not weigh anything in space and can float around freely, their body shape and size does not change.
Can wormholes exist naturally?
Einstein’s theory of general relativity mathematically predicts the existence of wormholes, but none have been discovered to date. … However, a naturally occurring black hole, formed by the collapse of a dying star, does not by itself create a wormhole.
Can a black hole die?
Hawking radiation reduces the mass and rotational energy of black holes and is therefore also known as black hole evaporation. Because of this, black holes that do not gain mass through other means are expected to shrink and ultimately vanish.
Is there anything inside a black hole?
Anything that passes the event horizon is trapped within the black hole. But right as gas and dust get closer and closer to the event horizon, the gravity from the black hole makes them spin really fast … forming lots of radiation.
Is time an illusion?
According to theoretical physicist Carlo Rovelli, time is an illusion: our naive perception of its flow doesn’t correspond to physical reality. … He posits that reality is just a complex network of events onto which we project sequences of past, present and future.
Is time a real thing?
Time is the indefinite continued progress of existence and events that occur in an apparently irreversible succession from the past, through the present, into the future.
Do wormholes exist?
Wormholes are sci-fi staples; over the years, many stories, books and movies have sent their protagonists zipping between widely separated locales via these cosmic shortcuts. Wormholes are possible, according to Einstein’s general theory of relativity, but nobody has ever spotted one.
Can a time machine be made?
Travelling in time might sound like a flight of fancy, but some physicists think it might really be possible. BBC Horizon looked at some of the most promising ideas for turning this staple of science fiction into reality. Ron Mallett has a dream: He wants to travel in time.