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The nearest star beyond the sun is Alpha Centauri which is 4.21016 meters away If you were to receive a radio message from this star today how long ago would it have been seen?
Actually the nearest star (except for the sun) is Proxima Centauri is next at 4.3 light-years from the Earth. It would take 3.4 years at one light-year/year for radio waves to reach Earth from there. This is because the radio waves are travelling in a vacuum and all electromagnetic wave in a vacuum travel at "C" AKA the speed of light.
What does a light year have to do with the sun and the earth?
A "light year" is a measure of distance, derived from "how far light can travel in one Earth year". Thus, if you shine a torch for the amount of time it takes the Earth to orbit the sun exactly once, that light would have travelled the distance of a "light year".
Trivia about light?
Light travels at the speed of 186,000 miles per second. A light year is the distance light travels in one year. It takes 8 minutes for light to travel from the sun to the earth.
How far is the nearest neutron star?
The nearest neutron star to us is called an unremarkable PSR J0108-1431. It is located about 424 light years from us in the constellation Cetus.
Why when astronauts travel into space they can still see the earth and moon?
Because space does not stop light from traveling. The earth has light sources on it that help it be seen on the dark side and on the light side it reflects a massive amount of light from the sun. The moon reflects light from the sun. The majority of what astronauts see locally is a reflection of the suns energy.
How long does it take for a ray of light to travel from the nearest star to the earth?
8.5 mins
How long does it take light to travel to the nearest star to us?
The nearest star to us is the SUN. It takes light about 8 minutes to travel from the Sun to Eart. #The next nearest star is Alpha Centurii. Light takes about 4.5 years to travel from this star to Earth.
How long would it take light to travel from the nearest star to us?
The nearest star to Earth is regarded as the Sun. The light from the Sun takes 8.3 minutes approximately, after calculating the distance of the Sun from Earth and the speed of light. It can be calculated by the formula: Time = Distance / Speed. If you mean the nearest star apart from the Sun, that is "Proxima Centauri". That light from that star takes about 4.22 years to reach us.
What is the equation for the travel time to the nearest star at the speed of light?
The formula to calculate travel time at the speed of light is distance divided by the speed of light. The nearest star to Earth is Proxima Centauri, which is about 4.24 light-years away. Therefore, the travel time to Proxima Centauri at the speed of light would be 4.24 years.
How does the suns energy reach Earth?
Waves of heat and light, called radiation, travel to earth.
How many lightyears is the nearest star from the earth?
The nearest star to Earth is the sun, at a distance of 0.000016 light years from Earth. The next nearest star, Proxima Centauri, is about 4.2 light years away.
How far does the light from the stars travel to earth?
This varies widely, between about four light-years for the nearest star (after the Sun, that is), to billions of light-years for stars in the farthest observable galaxies.
Light to travel from sun to earth?
It takes approximatly 7minutes to travel from sun to earth the sun light.
What are the waves that travel from the sun to earth?
Light waves travel from sun to the earth.
How many time does light travel around the earth in one second?
light can travel around earth about seven times
The nearest star is about blank light years away?
The nearest Star is the Sun which is 93 million miles away from the Earth. Alpha Centauri A then follows at 4.3-4.4 light years away from the Earth.
What does light travel as to get from the sun to earth?
As light, of course.
