What Evidence Indicates Protostars Have Formed

Q33: What causes the outward gas pressure that

Q34: <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB5757/.jpg" alt=" -The above image

Q35: in the following cartoon image of Orion,

Q36: How long can a 1-solar-mass star live<br>A)0.5

Q37: _ are small luminous nebulae excited by

Q39: Energy transport by _ is important when

Q40: A ZAMS star evolves _ and to

Q41: Why do nuclear reactions in a star

Q42: The hottest star in the Orion Nebula

Q43: Ninety percent of all stars fuse helium