First european to study stars using a telescope?

What kind of relationship did the soviet union have with the united states in 1945

At the casablanca conference, allied leaders signed an agreement to share military technology decided to launch an invasion of southern france agreed to accept only the unconditional surrender of the axis powers agreed to form a scientific team to create the atomic bomb

Brainliesttt !me : ) how did the world react to liberalization measures from the soviet union?