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Who first discovered that many galaxies are moving away from Earth?
Missing Attributes
Data elements or properties that are not present in a dataset or database record.
HTML 5 Standards
The fifth version of the HyperText Markup Language standards, specifying the features and behaviors of web pages and applications.
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Extensible Markup Language, a flexible way to create common information formats and share both the format and data on the World Wide Web, intranets, and elsewhere.
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