कौन सा तारा तंत्र हमारे सौरमंडल के सबसे नजदीक है, जो लगभग 4.37 प्रकाश-वर्ष की दूरी पर स्थित है?

With reference to Coronal Mass Ejections (CMEs), consider the following statements: I. They involve the expulsion of large clouds of magnetised plasma from the solar corona into interplanetary space. II. They travel at the speed of light because they are fundamentally electromagnetic emissions from the Sun. III. CME-like mass ejections have also been inferred in stars other than the Sun. Which of the statements given above are correct?

Which astronomer first provided observational evidence to float the idea of an expanding universe in 1929?