Let's even assume we can reach our desired speeds: 20% the speed of light, or ~60,000 km/s. That's approximately 300 times the speed of a typical star through our galaxy, or a few thousand times the relative speed of the stars through the interstellar medium.
Nothing can travel faster than 300,000 kilometers per second (186,000 miles per second). Only massless particles, including photons, which make up light, can travel at that speed. It's impossible to accelerate any material object up to the speed of light because it would take an infinite amount of energy to do so.
Traveling at around 20 percent the speed of light—so as fast as 100 million miles per hour—the craft and their tiny cameras would aim for the smallest but closest star in the system, Proxima Centari, and its planet Proxima b, 4.26 light-years from Earth.
Light from a moving source also travels at 300,000 km/sec (186,000 miles/sec). Say that Einstein's bike travels at 10% the speed of light (30,000 km/sec): the speed of light from Einstein's headlight does NOT equal 330,000 km/sec. The speed of light is constant and does not depend on the speed of the light source.
20% of the speed of light is 59,958,491.6 meters per second, slower than light in germanium (refractive index 4.1, speed 73,120 meters per nanosecond. The speed of light in vacuum, absent acceleration, gravity, and the expansion of space, is 299,792,458 meters per second, about a foot per nanosecond.
While 1% of anything doesn't sound like much, with light, that's still really fast – close to 7 million miles per hour! At 1% the speed of light, it would take a little over a second to get from Los Angeles to New York. This is more than 10,000 times faster than a commercial jet.
Oh, and if you're curious how fast 30% of the speed of light is, it's about 56,000 miles (90,123 kilometers) per second.
The speed of light traveling through a vacuum is exactly 299,792,458 meters (983,571,056 feet) per second. That's about 186,282 miles per second — a universal constant known in equations as "c," or light speed.
The speed of light in vacuum, commonly denoted c, is a universal physical constant that is exactly equal to 299,792,458 metres per second (approximately 300,000 kilometres per second; 186,000 miles per second; 671 million miles per hour).
How far can light travel in one minute? 11,160,000 miles.
For most space objects, we use light-years to describe their distance. A light-year is the distance light travels in one Earth year. One light-year is about 6 trillion miles (9 trillion km). That is a 6 with 12 zeros behind it!
The speed of light in vacuum is 3×108 m/s. Sunlight takes about 8 minutes to reach the Earth.
In special relativity, the speed of light is the ultimate speed limit to the universe. Nothing can travel faster than it.
Darkness travels at the speed of light. More accurately, darkness does not exist by itself as a unique physical entity, but is simply the absence of light. Any time you block out most of the light – for instance, by cupping your hands together – you get darkness.
This is a little hard to wrap your head around, but shadows can move faster than the speed of light, even though nothing can move faster than the speed of light.
As far as we know, nothing can travel faster than this. But across the universe, particles are often accelerated to 99.99 percent the speed of light.
Yet all across space, from black holes to our near-Earth environment, particles are, in fact, being accelerated to incredible speeds, some even reaching 99.9% the speed of light. One of NASA's jobs is to better understand how these particles are accelerated.
So, when we travel for 24 hours at 80% speed of light, approximately 40:00 hrs of earth time will have passed.
Based on our current understanding of physics and the limits of the natural world, the answer, sadly, is no. According to Albert Einstein's theory of special relativity, summarized by the famous equation E=mc2, the speed of light (c) is something like a cosmic speed limit that cannot be surpassed.
So taking the example in my story of travelling about 4.25 Lightyears at 90% the speed of light (265,000m/s~), there are two possible scenarios as far as I can see: Either it takes about 4 years for the people travelling at 90% LS but from Earths perspective it takes about 9 years.
Ergo, light is made of electromagnetic waves and it travels at that speed, because that is exactly how quickly waves of electricity and magnetism travel through space.
When it makes its closest approach, S2 will accelerate to speeds of almost 30 million km per hour, which is 2.5% the speed of light.
Summary: The speed of light is 3.00x108m/s and in mph is 6.708 x 108.