The distance from the Earth to the Moon (the closest object to us in space) is \(384,000,000 m\). From the Earth to the Sun is \(149,597,871,000 m\). Astronomical data from observations of ...

Measure the exact distance with the best rangefinder binoculars ... Their glass boasts 91% light transition so you get sharp images from edge to edge.

And so we measure distances in 'light years', which is very simply the distance that light travels in one year. Now, light travels very fast - 300,000 kilometres per second - so, to get the number ...

Testing is the way to ensure such a disaster doesn't happen, but even understanding how the physics of a light sail will work ...