Parsec

High school (ages 12+)
Space & Astronomy

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/parsec

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the precise meter equivalent?Approximately 3.0856775814913673 x 10^16 meters
2. What is the primary use?Simplifies calculations involving stellar parallax and astronomical distances
3. What is a parsec and why do astronomers use it?A parsec is a unit of distance that astronomers use to measure how far away stars and galaxies are. It comes from the way we look at stars from Earth and measure tiny angles called parallax. One parsec is about 30.9 trillion kilometers.
4. How is a parsec defined using Earth and the Sun?A parsec is the distance at which the Earth‑Sun distance (1 astronomical unit) would appear to be one arcsecond wide. Imagine a triangle with the Sun, Earth, and a far star; the hypotenuse of that triangle is one parsec.

Parallax: The apparent displacement of an object due to a change in the observer's position, a key method for measuring stellar distances.
Arcsecond: A unit of angular measurement equal to 1/3600 of a degree, representing a very small angle.
Astronomical Unit (AU): The average distance between the Earth and the Sun, serving as a fundamental baseline for cosmic measurements.
Light-Year: The distance light travels in a vacuum in one Julian year, approximately 9.461 trillion kilometers.