हबल के नियम और ब्रह्मांडीय अवलोकनों के अनुसार, दूरस्थ आकाशगंगाओं के बीच की दूरी के संबंध में कौन सी प्रवृत्ति पाई जाती है?

The 'Gaia Mission' of the European Space Agency is primarily designed for:

In his book ____________ on his astronomical discoveries, Galileo claimed to have seen mountains on the moon, the Milky Way made up of tiny stars, and four small bodies orbiting Jupiter.

In astronomical terms, what are pulsars?