A Narrow Encounter

After dinner, Su Chen took everyone home.

Everyone was rather full, and Yan Bingxue suggested with a smile, "How about we go for a walk?"

"Sure, we ate a little too much tonight anyway. A walk would help us digest!" Lin Xiu agreed with a smile and a nod.

"Exactly, I was thinking the same thing!" Su Haoqian said with a smile.

The family took a walk around the residential complex, with the two little ones, Tuantuan and Lele, happily leading the way.

They skipped and hopped along, full of energy, looking here and there, sometimes raising their heads to gaze at the sky and sometimes lowering them to look at the crossroads.

"Daddy, why are there so many fewer stars in winter nights than in summer?" Lele asked curiously.

"Hmm... that's a little complicated. Hmm... Daddy will ask Tuantuan and Lele a question first. Do you know which planet we live on?" Su Chen asked with a smile.

Lele nodded and said, "Of course I do! The planet we live on is Earth!"

"Hmm... then do you know which system Earth belongs to in the universe?" Su Chen asked with a smile.

"I know that too. Earth belongs to the Solar System!" Lele answered confidently.

"Then what is at the center of the Solar System?" Su Chen continued asking with a smile.

"Hmm... it's the Sun. Teacher said that in the Solar System of the Milky Way Galaxy, all the planets orbit the Sun!" Lele said with a smile.

"Mm-hmm, that's right. Earth rotates every day, and one full rotation around itself is called rotation! Then, one orbit around the Sun in a year is called revolution! Earth's rotation gives us day and night!"

"Now, Daddy has another question for you. What does one complete revolution of Earth create?"