Flashcard on Earth's Shape and Lunar Phases

Front

What is the sequence of lunar phases?

Back

New Moon → Waxing Crescent → Full Moon → Waning Crescent.

Front

What powers stars?

Back

Nuclear fusion of hydrogen into helium.

Front

How is a neutron star formed?

Back

A star collapses into a glob of hyper dense neutrons.

Front

How did Eratosthenes calculate Earth's circumference?

Back

By using angles of shadows in different cities.

Front

What occurs during a solar eclipse?

Back

The Moon passes between the Earth and Sun.

Front

Define a lunar phase.

Back

The different stages of the Moon's appearance as it orbits Earth, including New Moon, Waxing Crescent, Full Moon, and Waning Crescent.

Front

What is the difference between a solar eclipse and a lunar eclipse?

Back

A solar eclipse occurs when the Moon passes between the Earth and the Sun, while a lunar eclipse occurs when the Earth passes between the Sun and the Moon.

Front

What is the significance of the New Moon phase?

Back

It marks the beginning of the lunar cycle and is when the Moon is not visible from Earth.

Front

Explain the concept of nuclear fusion in stars.

Back

Nuclear fusion is the process where hydrogen nuclei combine to form helium, releasing energy that powers stars.

Front

What is a black hole?

Back

A region in space where the gravitational pull is so strong that nothing, not even light, can escape from it.