You can get a sense of the biggest problem with sending anything to other potentially habitable planets by checking…
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How to Compute the Distance Between Two Stars
This is actually an application of spherical trigonometry. A good description of this calculation, including an online tool to…

Does the Recent Discovery of the Most Distant Star Change the Estimated Age of the Universe?
Scientists using the Hubble Space Telescope recently reported the discovery of the most distant single star ever identified, whose…

Do We See Multiple Versions of a Star When Looking Back Through Spacetime?
No. When we look at an object in the universe we see that object as it existed when the…

Can One Use a Telescope to Observe Objects in the Future as Well as the Past?
Due to the fact that the speed of light is a constant value throughout the Universe, one always sees…

Cepheid Variable Stars as Cosmic Distance Rulers
It is the period-luminosity relation for Cepheid variable stars that provides a measurement of the absolute magnitude. You will…