Examlex
Suppose we discovered radio signals coming from the star Alpha Centauri, whose distance is 4.4 light-years from us, and we sent a crew in a spacecraft to visit it. If the spacecraft used revolutionary technology allowing it to travel at a speed of 0.5 c, how long would it take the spacecraft to get to Alpha Centauri, and how long a time would the astronauts say passed during the trip? (Ignore the time it would take to accelerate the spacecraft to reach a velocity of 0.5
c.)
First Quartile
The first quartile is a statistical measure that divides a data set into four equal parts, representing the value below which 25% of the data falls.
Hours
Units of time equivalent to 60 minutes, commonly used to measure durations and periods of the day.
Playing Video Games
The activity of engaging in games that involve interaction with a user interface to generate visual feedback on a display device.
Lower Quartile
A statistical measure indicating the value below which 25% of the observations in a dataset fall.
Q12: The "Lambda-CDM" model combines the properties of
Q27: In the 1990s, astronomers found that distant
Q33: Herbig-Haro objects are almost always found in
Q36: Elliptical galaxies contain hot gas that is
Q46: The Ring Nebula is a planetary nebula
Q47: The magnetic field of the Sun is
Q73: The fact that the surface of the
Q84: Gravitational lensing allows us to see distant
Q86: Globular clusters have much higher stellar densities
Q88: What was the temperature of the