The actual fascination
Sunlight contains different colours. In the atmosphere, molecules scatter blue light more strongly than red light. That scattered light reaches our eyes from across the sky. The blue is not a reflection of an enormous blue ceiling.
A better next question
An explanation is a starting point. Ask what changes when the light travels through more atmosphere, or when clouds arrive. Write down the thing you want explained before searching; it stops a neat answer from quietly answering a different question.
Your five-minute noticing mission
From a safe ordinary spot, describe the sky using three words that are not simply blue. Note the time and whether there are clouds. Look away from the Sun; you do not need a telescope, binoculars or a special purchase for this activity.
Keep the observation separate
Your note might say pale near the horizon. Your explanation might mention scattering. Put those on different lines. An observation records what you saw; an explanation proposes why. Both become more useful when you can tell them apart.
Your small mission
Write one observation and one follow-up question. No equipment needed.
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