Why does the Moon have phases?

We see different amounts of its sunlit side

What is the Bortle scale?

A measure of night sky darkness

Night Sky Objects Challenge – A 10-Question Trivia Quiz

This night sky objects challenge covers what you can see after dark: the Moon's phases, bright planets, the Pleiades, the Orion Nebula, the Andromeda Galaxy, the ISS, satellites and the Milky Way. A 10-question trivia quiz with answers for stargazers.

Start Night Sky Objects Challenge

🎯 Daily Trivia Challenge • 🧠 10 Questions • ⏱️ 150 Seconds

Question 1 / 10 Time: 150s

Brightest
What is usually the brightest object in the night sky after the Moon?
Planets
How can you tell planets from stars by eye?
Cluster
Which star cluster is called the Seven Sisters?
Galaxy
What is the most distant object easily visible to the naked eye?
ISS
How does the ISS look from Earth?
Phases
Why does the Moon have phases?
Trains
What are lines of moving dots often seen after 2019?
Mars
Which planet looks distinctly reddish?
Moonlight
Where does moonlight come from?
Dark
What is the Bortle scale?

Explanations: answer key for all 10 questions

Q1: What is usually the brightest object in the night sky after the Moon?
Answer: Venus
It is called the evening or morning star.
Q2: How can you tell planets from stars by eye?
Answer: Planets usually shine steadily
Stars twinkle more.
Q3: Which star cluster is called the Seven Sisters?
Answer: Pleiades
It is in Taurus.
Q4: What is the most distant object easily visible to the naked eye?
Answer: Andromeda Galaxy
It is 2.5 million light-years away.
Q5: How does the ISS look from Earth?
Answer: A bright moving point of light
It reflects sunlight.
Q6: Why does the Moon have phases?
Answer: We see different amounts of its sunlit side
A cycle lasts about 29.5 days.
Q7: What are lines of moving dots often seen after 2019?
Answer: Starlink satellite trains
They spread out over time.
Q8: Which planet looks distinctly reddish?
Answer: Mars
Its color comes from iron oxide.
Q9: Where does moonlight come from?
Answer: Reflected sunlight
The Moon has no light of its own.
Q10: What is the Bortle scale?
Answer: A measure of night sky darkness
It runs from 1 to 9.

Night Sky Objects Challenge – What You Can See Tonight

The night sky offers plenty to see without a telescope. The Moon changes shape through its phases, bright planets like Venus and Jupiter shine steadily and constellations rotate through the seasons.

With binoculars, you can spot the Pleiades, the Orion Nebula and even the Andromeda Galaxy. Satellites and the International Space Station move steadily across the sky, and meteors flash by during showers.

Light pollution hides many of these sights from city dwellers. Dark-sky parks and reserves protect natural night skies, and apps help beginners identify stars, planets and satellites.

What This Quiz Teaches

This challenge is for beginner stargazers.

Which object is brightest
How to tell planets from stars
What the Pleiades are
What the ISS looks like
Why the Moon has phases

Did You Know?

Jupiter's moons are visible with binoculars.
Saturn's rings need a small telescope.
Dark adaptation takes about 20 minutes.
Red flashlights preserve night vision.
The zodiacal light is sunlight on dust.