Approximately one million characters is roughly equivalent to 200,000 words, assuming an average of five characters per word, including spaces and punctuation. This is about the length of a lengthy novel or a comprehensive non-fiction book. In terms of printed pages, it can fill around 400 to 500 pages, depending on formatting.
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One light year is approximately equal to seven trillion miles. So, 23 million light years is approximately equal to 161 quintillion miles. In scientific notation, that is 1.61 x 1020 miles.
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In the more widely-used American numbering system, a billion is equal to one thousand million (1,000,000,000) while a trillion is equal to one million million (1,000,000,000), a difference of 999,000,000,000. In the British and Commonwealth system, a billion is equal to one million million (1,000,000,000,000) while a trillion is equal to one million million million (1,000,000,000,000,000,000), a difference of 999,999,000,000,000,000.
Assuming one billion is equal to one thousand million, 456 million is equal to 456/1000 = 0.456 billion.