Question

Which description best summarizes the steps that take place during black hole formation, in the correct order?(1 point) Responses A small star gains mass through fusion reactions; core of star collapses; increased radiation triggers a supernova. A small star gains mass through fusion reactions; core of star collapses; increased radiation triggers a supernova. Supernova triggers fusion reactions; massive star implodes due to extreme radiation; volume and mass of star increase rapidly. Supernova triggers fusion reactions; massive star implodes due to extreme radiation; volume and mass of star increase rapidly. A massive star depletes its nuclear fuel; gravity overpowers the star; supernova occurs; core of star collapses. A massive star depletes its nuclear fuel; gravity overpowers the star; supernova occurs; core of star collapses. Supernova explodes a massive star; remaining core expands; nuclear reactions diminish the effects of gravity.

Answer 1

How do emission and reflection nebulae differ?(1 point) Responses interactions with light interactions with light contain remnants of stars contain remnants of stars hard line edges hard line edges the presence of young stars

Answer 2

Which statement best describes the galaxies closest to the Milky Way?(1 point) Responses These galaxies consist of mostly old stars. These galaxies consist of mostly old stars. These galaxies are all identified as spiral. These galaxies are all identified as spiral. These galaxies are independent of and unaffected by the Milky Way's gravitational pull. These galaxies are independent of and unaffected by the Milky Way's gravitational pull. These galaxies include irregular, spiral, and elliptical types.

Answer 3

What is the main challenge astronomers face when trying to directly detect black holes?(1 point) Responses Black holes are empty. Black holes are empty. Black holes trap all light. Black holes trap all light. Black holes are too small. Black holes are too small. Black holes are too black. Black holes are too black.