Beyond Yesterday and Travelling Tomorrow -Tasnim Hossain

Time travel has always been one of the most fascinating dreams of humankind. From cartoons like Doraemon’s time machine to great scientists like Albert Einstein, everyone has shown deep curiosity about moving beyond yesterday and tomorrow. But is it really possible, or is it only imagination? Science tells us that time travel may not be pure fantasy. To understand it, we must first learn about dimension.

Dimensions
A dimension is simply a way to measure or experience reality.

1D → Only length (a straight line)
2D → Length + width (a square or rectangle)
3D → Length + width + height (a cube, our everyday world)
4D → 3D space + time

For example, when a child runs, in 3D we see only the body’s size and shape. But in 4D, we could see all moments—birth, childhood, running, laughing—together in time. We humans live in 4D, but we only experience time step by step, like moving forward through a movie.

Traveling to the future
Science shows that moving into the future is possible in theory:

1. By Speed → If you travel close to the speed of light in a spaceship, time will pass slowly for you compared to Earth. After five years in space, you may return to find 50 years have passed on Earth.

2. By Gravity → Time moves slower in a place with extreme gravity. Near a black hole, spending 1 hour could mean many years passing on Earth.

3. Time Dilation → The scientific effect where time stretches or compresses because of speed or gravity.

So, going into the future is possible. But coming back to the past is almost impossible—unless wormholes exist.

Travelling to the past
Moving to the past is one of the greatest mysteries of the universe. Scientists imagine that if wormholes are discovered, travelling to the past could become possible.

Warm Hole- This area The cosmic shortcut 
Imagine the universe as a giant sheet of cloth. If you stand at one end and your friend at the other, reaching him normally would take a long time. But if the cloth is folded and a hole is poked through, you could instantly meet him.

This is what scientists call a wormhole—a tunnel that bends space and time. If one side of the wormhole connects to the future, you step into tomorrow. If one side connects to the past, you step into yesterday.

In fiction, like Doraemon’s time machine, wormholes are shown as magical doors that connect present, past, and future.

The history of wormholes
In 1915, Albert Einstein introduced the theory of general relativity, showing that space and time can bend.

In 1935, Einstein and Nathan Rosen first described the idea of a “bridge” in space-time, later called the Einstein–Rosen Bridge, or wormhole.

Later, physicists like Kip Thorne studied whether wormholes could stay open long enough for humans to travel. They discovered it would require “exotic matter”—a strange material we have not yet found.

Therefore, wormholes are mathematically possible, but no one has discovered one yet.

Conclusions
Time travel remains one of science’s greatest mysteries. Theories like relativity and wormholes suggest that moving beyond yesterday and tomorrow may not be impossible. Travelling to the future seems possible through speed and gravity, while travelling to the past may require wormholes that science has yet to prove.

For now, time travel is a bridge between imagination and science. Maybe one day, today’s fantasy will become tomorrow’s reality.