Einstein was right, again.

Einstein’s general relativity is probably one of the most successful theories in modern physics. So far, it has passed every observational and experimental test. Now, two more predictions of Einstein’s theory have been confirmed.
The Gravity Probe B (GP-B) experiment used four ultra-precise gyroscopes to measure two aspects of Einstein’s theory …

Traveling faster than light?

That’s probably one of the most common questions people ask when thinking about space travel: is it possible to travel faster than light? And if so, will we be able to, someday?
While this could have been part of the article Will we ever travel to other stars?, I chose to …

Avoiding the grandfather paradox

Time travel has always been fascinating to everyone, and it has been tackled in every possible way by science fiction. A concept of Einstein’s general relativity called Closed Timelike Curves (CTCs) offers the possibility to travel backwards in time. Time traveling has raised various paradoxes, such as the grandfather paradox: …

Solving the cosmological constant problems

Why is the expansion of the Universe accelerating? This question is one of the biggest mysteries faced by cosmologists; it is so puzzling that they finally called what causes the expansion to accelerate dark energy. Nobody knows the nature of this energy, as we have only been able to observe …

Will we ever travel to other stars?

Today, we are speaking about space tourism, or sending men to Mars. What about longer, much longer journeys, out of our solar system? Of course, the question has been around for quite some time, and it seems that space agencies are more and more interested in the idea. When reading …

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