what is galaxy ???????
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a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.
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ᴀ ɢᴀʟᴀxʏ ɪs ᴀ ʜᴜɢᴇ ᴄᴏʟʟᴇᴄᴛɪᴏɴ ᴏғ ɢᴀs, ᴅᴜsᴛ, ᴀɴᴅ ʙɪʟʟɪᴏɴs ᴏғ sᴛᴀʀs ᴀɴᴅ ᴛʜᴇɪʀ sᴏʟᴀʀ sʏsᴛᴇᴍs, ᴀʟʟ ʜᴇʟᴅ ᴛᴏɢᴇᴛʜᴇʀ ʙʏ ɢʀᴀᴠɪᴛʏ. ... ᴀ ɢᴀʟᴀxʏ ɪs ᴀ ʜᴜɢᴇ ᴄᴏʟʟᴇᴄᴛɪᴏɴ ᴏғ ɢᴀs, ᴅᴜsᴛ, ᴀɴᴅ ʙɪʟʟɪᴏɴs ᴏғ sᴛᴀʀs ᴀɴᴅ ᴛʜᴇɪʀ sᴏʟᴀʀ sʏsᴛᴇᴍs. ᴀ ɢᴀʟᴀxʏ ɪs ʜᴇʟᴅ ᴛᴏɢᴇᴛʜᴇʀ ʙʏ ɢʀᴀᴠɪᴛʏ.
ᴍᴀʀᴋ ᴍᴇ ᴀs ᴀ ʙʀᴀɪɴʟɪᴇsᴛ
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