Cosmology This concerns the study of the origin, evolution, basic structure and eventual fate of. You could even study whether or not time travel is possible. So, astronomers and stargazers are always looking at objects as they appeared in the past. Astrophysics Studying astrophysics means looking at the physics and properties of celestial objects, including stars, planets and galaxies, their properties and how they behave. Light from far distant galaxies can take thousands or millions of years to reach our eyes. And the light from Proxima Centauri, our next nearest star, takes over 4 years. The Sun’s light takes about 8 minutes to reach Earth. It only takes a couple of seconds for the Sun’s light reflected from the Moon to reach Earth. The Moon is the only object we see in (almost) real time. Light years are used as a measurement in space simply because the distances are so great and metres and kilometres are just too impractical. Think of a light year as a measurement of distance – just like 1m or 1km. Light travels at 300,000 kms/second and in one year this equates to about 9.5 trillion kms. The short answer is: about 9,500,000,000,000kms!ġ light year is equal to the distance that light travels in 1 year. Astrology attempts to study how the positions, motions, and properties of celestial bodies affect people and events on Earth. When astronomers study celestial bodies, they are looking into the past! It may sound strange but it’s because light takes time to travel from space to us here on Earth. A horoscope or “your stars” is written for supposed influences on events in the future.
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