Shouldn’t we be looking for life on planets that formed over 10 billion years ago as they’ve had more time for life to form?

Planets that formed over 10 billion years ago are about 5 billion light years from us, meaning that if we could somehow study planets that far away (we can’t) the light reaching us from there would have taken 5 billion years to reach us. Therefore, we’d be seeing what the planet looked like 5 billion... Continue Reading →

How long would it take to travel to the nearest star?

Proxima Centauri, is our nearest star, about 4 light years away. A light year is the distance light travels in one year, or 9,460,730,472,581 kilometers. That's 9.46 trillion kilometers, or about 5.88 trillion miles. The fastest space ship we ever built was the Juno spacecraft, which in 2016 broke all speed records in space with a... Continue Reading →

Which is more difficult to achieve 100 years from now, building a giant telescope to directly observe other planets in a distant Galaxy or building a faster than light space ship?

Faster than light speed will never be possible, ever. The best you’ll be able to do is maybe 1/10th the speed of light given an enormous amount of propellant, and then you’ll have to slow down at the end of the trip using just as much fuel as it took you to go that fast in the... Continue Reading →

If two ships are travelling side be side at some major fraction of the speed of light (e.g. 90%) and are, say, 100 yards apart, would they be able to see each other out the portholes?

Great question, and you see, that’s what we mean when we say everything is relative. Your “speed” is always relative to something else. If you don’t compare it to something else, you might as well be standing still. Relative to you, the other spaceship is standing still. You are both just floating there while Earth quickly moves... Continue Reading →

If a tennis ball flies at 99% of light speed, will it be in every location of its trajectory, or will it skip some on its way?

The tennis ball will not appear in every location of it’s trajectory nor will it skip some on it’s way. It will look to us that time on the tennis ball has slowed down. Time and space are relative. What this means to your question is simply the speed of the tennis ball must be... Continue Reading →

Using the latest technologies & maneuvers, what speeds can we hope to achieve in space flight?

I'm just wondering for practical purposes. Doesn't even have to be a manned mission, so all that extra life support weight can be dumped. Using optimal fuel mixtures, the latest technology, & as many gravity slings & other natural phenomena as possible how fast could we go? According to Wikipedia: New Horizons is currently making... Continue Reading →

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