A Complete Collection of 100000 Whys
Fav十万个为什么
为什么天空会变黑？
1、夜晚地球自转到面向太阳的一侧，太阳光无法照射到面向太阳的地球背面，因此天空变黑。
2、大气层中的空气和水蒸气会散射和吸收部分阳光，使得夜晚的天空更加黑暗。
3、没有光源照射时，天空自然会呈现黑色，因为天空本身就是一片空旷的空间。
4、城市中的灯光和污染物会干扰自然天空的黑暗，但即便如此，远离城市的地方夜晚天空依然会变黑。
5、宇宙中的星星和月亮虽然会发光，但它们的光线相对微弱，不足以使整个天空变亮。
总之，天空变黑是因为地球自转导致夜晚面向太阳的一面失去阳光照射，加上大气层的散射和吸收作用，以及缺乏足够的光源，使得夜晚的天空呈现黑色。
1. This tool has compiled a vast collection of questions and answers to help answer your everyday queries.
2. Simply enter the keywords for your search directly into the input box above.
3. The data in this tool is collected from the internet; if you find any errors, please report them to us so we can correct them.
Recommended Tools
![Online whiteboard]()
Online whiteboard
A high-value online whiteboard tool that supports pressure sensation
![Car loan calculator]()
Car loan calculator
Online car loan calculation tool
![Best viewing distance calculator for TV tablets]()
Best viewing distance calculator for TV tablets
Calculate the optimal viewing distance based on the display size of the TV or tablet
![Blood pressure calculator]()
Blood pressure calculator
Calculate whether blood pressure is normal by measuring systolic and diastolic blood pressure
![Spherical surface area calculator]()
Spherical surface area calculator
Online calculation of spherical surface area
![Cone surface area calculator]()
Cone surface area calculator
Calculate the surface area of a cone online
![Hexagonal Area Calculator]()
Hexagonal Area Calculator
Calculate the area of a regular hexagon online
![State Secrets SM2 Encryption/Decryption]()
State Secrets SM2 Encryption/Decryption
An online tool for encrypting, decrypting, signing, and verifying using the State Secrets SM2 algorithm
![CSS Background Gradient Generator]()
CSS Background Gradient Generator
Generate CSS gradient background color codes online, which can be visually debugged online.
![HTML attribute cleaning tool]()
HTML attribute cleaning tool
Clean up the attributes on the div online
![Stopwatch timing tool]()
Stopwatch timing tool
Online stopwatch/stopwatch timing tool
![Mobile phone number location inquiry]()
Mobile phone number location inquiry
Online mobile phone number attribution query tool
![Online speaker (horn) dust cleaning tool]()
Online speaker (horn) dust cleaning tool
One click cleaning of your phone speaker
![Hand speed test]()
Hand speed test
Online testing of mouse click speed
![Vision training tools]()
Vision training tools
Online vision training and eye relaxation tools
![National Day Avatar Generator]()
National Day Avatar Generator
Add national flag decoration or pentagram decoration to the avatar
![Online text deduplication tool]()
Online text deduplication tool
Online text deduplication tool
![Equal video segmentation]()
Equal video segmentation
Divide the video into N equal parts online and download them locally
![Video Flip]()
Video Flip
Flip the video horizontally or vertically online, and download the flipped video locally.
![Web page Gzip compression detection]()
Web page Gzip compression detection
Check whether the webpage is compressed by GZIP on the page and calculate the size of the compression ratio
![Temperature unit conversion]()
Temperature unit conversion
Online conversion tool for temperature units
![Next gobang]()
Next gobang
Online web version of AI Gomoku battle mini game
![Postal Code Inquiry]()
Postal Code Inquiry
Postal Code (Postal Code) Query for Counties, Cities, and Regions Nationwide
![Password strength detection tool]()
Password strength detection tool
Check the strength of passwords online to ensure your security
粤ICP备2021116614号