A decade ago,many astrophysicists thought that the oldest globular clusters were 14-16 billion years old.Why did this create problems,and how did new Hubble and Hipparcos data resolve them?

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The Answer of A decade ago,many astrophysicists thought that the oldest globular clusters were 14-16 billion years old.Why did this create problems,and how did new Hubble and Hipparcos data resolve them?

A Decade Ago,many Astrophysicists Thought That the Oldest Globular Clusters