William Lassell

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/william-lassell

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. When was William Lassell born?June 18, 1799
2. When did William Lassell die?October 5, 1880
3. What was William Lassell's job?Merchant
4. What is the key astronomical discoveries?Triton (moon of Neptune, 1846), Ariel and Umbriel (moons of Uranus, 1851)
5. What is the notable instrument?24-inch aperture reflecting telescope

Reflecting Telescope: An optical instrument that uses mirrors to gather and focus light, enabling observation of distant celestial objects.
Planetary Satellite: A natural celestial body gravitationally bound to orbit a planet, commonly referred to as a moon.
Aperture: The diameter of the primary light-gathering component of a telescope, directly influencing its resolving power and light grasp.
Nebulae: Interstellar clouds of dust, hydrogen, helium, and other ionized gases, often sites of star formation or remnants of dying stars.