A calm prehistoric scene with large dinosaurs walking through a warm ancient landscape.

Big question

为什么恐龙都不见了？

Wèishénme kǒnglóng dōu bújiàn le?

Why did dinosaurs disappear?

恐龙后来都不见了，是因为很久以前地球发生了很大的变化，大部分恐龙都活不下去了。

Kǒnglóng hòulái dōu bújiàn le, shì yīnwèi hěn jiǔ yǐqián dìqiú fāshēng le hěn dà de biànhuà, dà bùfen kǒnglóng dōu huó bu xiàqù le.

很久很久以前，恐龙在地球上生活了好长好长的时间。后来，世界发生了很大的变化。科学家觉得，有一颗很大的太空石头撞到了地球，之后光线、空气、植物和天气都变了很多，所以大部分恐龙没有办法继续活下去。

Hěn jiǔ hěn jiǔ yǐqián, kǒnglóng zài dìqiú shàng shēnghuó le hǎo cháng hǎo cháng de shíjiān. Hòulái, shìjiè fāshēng le hěn dà de biànhuà. Kēxuéjiā juéde, yǒu yì kē hěn dà de tàikōng shítou zhuàng dào le dìqiú, zhīhòu guāngxiàn, kōngqì, zhíwù hé tiānqì dōu biàn le hěn duō, suǒyǐ dà bùfen kǒnglóng méiyǒu bànfǎ jìxù huó xiàqù.

如果你可以在安全的地方远远地看一种恐龙，你会想看哪一种呢？

Rúguǒ nǐ kěyǐ zài ānquán de dìfang yuǎnyuǎn de kàn yì zhǒng kǒnglóng, nǐ huì xiǎng kàn nǎ yì zhǒng ne?

Dinosaurs disappeared because Earth changed in huge ways long ago, and most of them could not survive those changes.

Long, long ago, dinosaurs lived on Earth for a very long time. Then the world changed in big ways. Scientists think a giant space rock hit Earth, and after that the light, air, plants, and weather changed so much that most dinosaurs could not keep living.

If you could safely watch one dinosaur from far away, which one would you choose?