17. The nearest star is approximately four light-years from Earth. Imagine that an alien civilization has been discovered there. You send them a message. How long do you have to wait for their reply, assuming they respond immediately?
17. The nearest star is approximately four light-years from Earth. Imagine that an alien civilization has...
1. If an alien civilization is located 60 light-years away and they detect the earliest Earth tv transmissions (from ~1930), what year should we receive the first message from the aliens? How did you arrive at your answer? 2. Assume you wanted to have a discussion with a civilization located near the center of the Milky Way Galaxy. What would be the minimum time between sending the signal and receiving a reply? we live about 2.5x10^20 meters from the center...
Light requires 4.5 years to travel from the nearest star to earth. If we could travel there in a spaceship going 90% of the speed of light, the trip would require 5.0 years according to clocks on earth. How much time would pass for the passengers in the ship?
The nearest star to Earth besides the Sun is Proxima Centauri, which is a distance of approximately 4 light years away. A planet that may be able to sustain liquid water on its surface was discovered in 2016 orbiting Proxima Centauri. According to observers on Earth, a spaceship that travels at 0.9c should be able to reach the planet in 3.6 years. How long would the trip take according to astronauts on board the spaceship?
The nearest star to Earth is Proxima Centauri, 4.3 light-years away. Part A At what constant velocity must a spacecraft travel from Earth if it is to reach the star in 4.9 years, as measured by travelers on the spacecraft? b: How long does the trip take according to Earth observers? in years
The nearest star to Earth is Proxima Centauri, 4.2 light-years away. Part A At what constant velocity must a spacecraft travel from Earth if it is to reach the star in 3.9 years, as measured by travelers on the spacecraft? Express your answer using two significant figures. v=_____c Part B How long does the trip take according to Earth observers? Express your answer using two significant figures. t=_____ years
The nearest star to Earth is Proxima Centauri, 4.3 light-years away. At what constant velocity must a spacecraft travel from Earth if it is to reach the star in 5.3 years, as measured by travelers on the spacecraft? Express your answer using two significant figures. C is the answers unit. How long does the trip take according to Earth observers? Express your answer using two significant figures. years is the answers unit.
Proxima Centauri, the nearest start to the Sun, is about 4 light years from Earth, and Antares is about 520 light years from Earth. Antares is a very bright star easily seen with the naked eye but Proxima Centauri is so dim that a small telescope is needed to see it. What can you say about the relative luminosities of Antares and Proxima Centauri?
You travel to a star 195 light-years from Earth at a speed of 2.90*10^8m/s . What do you measure this distance to be? units ly
I4 You travel to a star 185 light-years from Earth at a speed of 2.90×108 m/s . Part A What do you measure this distance to be? l = ??? ly
f) in vacuum, light travels at about 186,282 miles per second. One mile is about 161 kilometers (km). Astronomers prefer to use units of distance that are reasonable in describing how far objects are from Earth. For example, for distances in the solar system we use the astronomical unit (AU), which is equal to the average distance of Earth from the Sun; 1 AU is about 150 million km. For distances to stars and galaxies, astronomers use the light-year (1...