1. Light year is the unit used to measure distances between heavenly bodies. _
2. The earth revolves around the sun from east to west.
3. In the period between the New Moon and Full Moon, the moon wanes.
4. Comets are also known as shooting stars. _

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Solution

1. The given statement is true.

Explanation: The ordinary units of measurement are not used for measuring distance in the universe. Light-year is a unit used to measure distance that is equal to the distance covered by light travelling at a speed of 3,00,000 kilometres per second in one year.

2. The given statement is false.

Explanation: The Earth rotates on its own axis while revolving around the Sun. The direction of the rotation of the Earth is from west to east. This is the reason we see sunrise from the east.

3. The given statement is false.

Explanation: When the Moon moves from new moon to full moon, the visible portion of the Moon increases.

4. The given statement is true.

Explanation: Comets are huge masses of snow and rocks that orbit the Sun. They have huge glowing tails; hence, they are also known as shooting stars.

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1. Light year is the unit used to measure distances between heavenly bodies. _________ 2. The earth revolves around the sun from east to west. ________ 3. In the period between the New Moon and Full Moon, the moon wanes. ________ 4. Comets are also known as shooting stars. _________

1. Light year is the unit used to measure distances between heavenly bodies. _
2. The earth revolves around the sun from east to west.
3. In the period between the New Moon and Full Moon, the moon wanes.
4. Comets are also known as shooting stars. _