探险家号

1. 1

   我们在太空中的位置

   • Our place in space · 10 分钟

     From your street to the edge of the Milky Way: where Earth sits, how far away things are, and how we measure it.

2. 2

   从太阳走到海王星

   • A walk from the Sun to Neptune · 10 分钟

     Almost every picture of the solar system is wrong about scale. Walk it at true scale and feel how empty space really is.

3. 3

   每个世界的天数和年份

   • Days and years on each world · 10 分钟

     Venus takes longer to spin once than to go around the Sun, Jupiter spins in under ten hours, and Neptune's year is 165 of ours. Why?

4. 4

   为什么我们有季节

   • Why we have seasons · 12 分钟

     It is not about distance from the Sun. It is about tilt. See why summer days are long and winter noons are low.

5. 5

   月相和日食

   • Moon phases and eclipses · 12 分钟

     Why the Moon changes shape through the month, and why we do not get an eclipse every new and full Moon.

6. 6

   夜空和光污染

   • The night sky and light pollution · 10 分钟

     Most people alive today have never seen a truly dark sky. See how many stars light pollution hides, and what anyone can do about it.

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