TPO62_L2_Encounter of Galaxies part 2

Think about all the gravitational forces involved. In this sentence, what does 'gravitational' mean?

• 引力的
• 重力的
• 磁力的
• 张力的

Since the average separation between galaxies is only about 20 times their diameter. What does 'average' mean here?

• 平均
• 总体
• 典型
• 标准

Since the average separation between galaxies is only about 20 times their diameter. In this context, what does 'diameter' refer to?

• 直径
• 周长
• 半径
• 长度

They often meet, we call it an encounter. What is the meaning of 'encounter' in this sentence?

• 遭遇
• 遇见
• 相遇
• 接触

They meet in a variety of ways. In this sentence, what does 'variety' mean?

• 类型
• 种类
• 多样性
• 变化

Mergers are the most extreme kinds of galaxy encounters. What does 'extreme' mean here?

• 极端的
• 极限的
• 最大的
• 特别的

Mergers are the most extreme kinds of galaxy encounters. In this context, what does 'galaxy' refer to?

• 太空
• 星系
• 星球
• 宇宙

A merger is when two galaxies meet and they don’t have enough momentum to keep going. What does 'momentum' mean in this sentence?

• 动力
• 动量
• 速度
• 力量

The galaxies pass through each other, each going its separate way. What is the meaning of 'separate' here?

• 分开的
• 单独的
• 分离的
• 独立的

Usually a larger galaxy will absorb, sort of swallow a smaller one. What does 'swallow' mean in this context?

• 吞噬
• 吸收
• 包裹
• 包含