Which of the following is a star?
QuestionWhich of the following is a star?
The correct answer is B.
A star is a huge luminous ball of gas held together by its own gravity. The Sun is an example of an astronomical object that is a luminous burning plasma.
The Earth and the Moon are not stars and are made up of more than just gases or plasma. Earth's crust for instance is made up of several elements: oxygen, silicon, aluminum, iron, calcium, sodium, potassium and so on.
Stars and planets do share something in common, though. Gravity creates both stars and planets by pulling together the material from which they are made, and preventing them from escaping into space.
Finally, nebula is a giant cloud of dust and gas in space. The word "nebula" comes from the Greek word for "cloud." In some nebulae, stars form out of large clouds of gas and dust; once some stars have formed inside the cloud, their light illuminates the cloud, making it visible to us.
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