Why is the Earth tilted at 23.5 degrees on its axis?
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sᴄɪᴇɴᴛɪsᴛs ᴇsᴛɪᴍᴀᴛᴇ ᴛʜᴀᴛ ᴇᴀʀᴛʜ sᴜғғᴇʀᴇᴅ ᴀʀᴏᴜɴᴅ 10 ᴏғ ᴛʜᴇsᴇ ɢɪᴀɴᴛ ᴄᴏʟʟɪsɪᴏɴs. ... ᴛᴏᴅᴀʏ, ɪɴsᴛᴇᴀᴅ ᴏғ ʀᴏᴛᴀᴛɪɴɢ ᴜᴘʀɪɢʜᴛ, ᴛʜᴇ ᴇᴀʀᴛʜ's ᴀxɪs ɪs ᴛɪʟᴛᴇᴅ 23.5 ᴅᴇɢʀᴇᴇs. ᴛʜᴇ ᴀɴɢʟᴇ ᴠᴀʀɪᴇs ᴀ ʟɪᴛᴛʟᴇ ᴏᴠᴇʀ ᴛɪᴍᴇ, ʙᴜᴛ ᴛʜᴇ ɢʀᴀᴠɪᴛᴀᴛɪᴏɴᴀʟ ᴘᴜʟʟ ᴏғ ᴛʜᴇ ᴍᴏᴏɴ ᴘʀᴇᴠᴇɴᴛs ɪᴛ ғʀᴏᴍ sʜɪғᴛɪɴɢ ʙʏ ᴍᴏʀᴇ ᴛʜᴀɴ ᴀ ᴅᴇɢʀᴇᴇ ᴏʀ sᴏ. ᴛʜɪs ᴛɪʟᴛ ɪs ᴡʜᴀᴛ ɢɪᴠᴇs ᴜs sᴇᴀsᴏɴs.
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Scientists estimate that Earth suffered around 10 of these giant collisions. ... Today, instead of rotating upright, the Earth's axis is tilted 23.5 degrees. The angle varies a little over time, but the gravitational pull of the moon prevents it from shifting by more than a degree or so. This tilt is what gives us seasons.
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