Understanding Strong and Weak Claims

In Example 1, which claim is the strong one?

• Stars twinkle because they are very far away.

• Stars appear to twinkle because Earth’s atmosphere bends their light as it passes through different air layers.

• Stars twinkle because they are small.

• Stars shine because they glow in space.

In Example 2, which claim is the weak one?

• Stars are cool to look at night.

• Stars are massive spheres of hot plasma that produce energy through nuclear fusion.

• Stars twinkle because they are small.

• Stars shine because nuclear fusion releases light and energy.

In Example 3, which claim is the strong one?

• Stars shine because they glow in space.

• Stars shine because nuclear fusion releases light and energy that travels across space to Earth.

• Stars blink on and off at night.

• Stars twinkle because they are very far away.

In Example 4, which claim is the weak one?

• Stars blink on and off at night.

• Stars seem to change brightness because of atmospheric turbulence that bends their light.

• Stars twinkle because Earth’s atmosphere refracts their light.

• Stars are massive spheres of hot plasma.

In Example 5, which claim is the strong one?

• Stars twinkle because they are small.

• Stars twinkle because Earth’s atmosphere refracts their light, causing changes in brightness and color.

• Stars shine because they glow in space.

• Stars are cool to look at night.

Which claim is stronger regarding why stars appear to move in the sky?

• Stars move around the sky every night.

• Stars appear to move because Earth rotates, making them rise in the east and set in the west.

• Stars move because they are pushed by the wind.

• Stars move because they are alive.

What is the stronger claim about why stars sparkle?

• Stars sparkle because of clouds.

• Stars sparkle because layers of air with different temperatures bend their light as it travels to Earth.

• Stars sparkle because they are made of glitter.

• Stars sparkle because they are very small.

Which claim is stronger about why stars shine?

• Stars shine because they are lights in the sky.

• Stars shine because they are burning spheres of plasma undergoing constant fusion reactions.

• Stars shine because they are made of diamonds.

• Stars shine because they are close to the sun.

What is the stronger claim about why stars look dim?

• Stars look dim because they're tiny.

• Stars look dim because they are extremely far away, and their light has traveled for thousands of years to reach us.

• Stars look dim because they are covered by clouds.

• Stars look dim because they are turned off during the day.

Which claim is stronger regarding why planets do not twinkle like stars?

• Planets twinkle just like stars.

• Planets do not twinkle like stars because their light is closer and not bent as much by Earth’s atmosphere.

• Planets do not twinkle because they are not made of light.

• Planets do not twinkle because they are invisible.