What is a Bok globule made of?

What is a Bok globule made of? They contain molecular hydrogen (H2), carbon oxides and helium, and around 1% (by mass) silicate dust. Bok globules most commonly result in the formation of double- or multiple-star

What is a Bok globule made of?

They contain molecular hydrogen (H2), carbon oxides and helium, and around 1% (by mass) silicate dust. Bok globules most commonly result in the formation of double- or multiple-star systems.

What is a globule in space?

The globules are most likely dense clumps of gas and dust that existed before the hot, massive stars were born. But once the stars began to irradiate and destroy their surroundings, the clumps became visible when their less dense surroundings were eroded away.

What is the protostar stage?

A protostar is a very young star that is still gathering mass from its parent molecular cloud. The protostellar phase is the earliest one in the process of stellar evolution. For a low-mass star (i.e. that of the Sun or lower), it lasts about 500,000 years.

What causes dark nebula?

The extinction of the light is caused by interstellar dust grains located in the coldest, densest parts of molecular clouds. Dark clouds appear so because of sub-micrometre-sized dust particles, coated with frozen carbon monoxide and nitrogen, which effectively block the passage of light at visible wavelengths.

What do you mean by globule?

: a tiny globe or ball especially of a liquid globules of mercury.

What is a Bok globule quizlet?

Bok globules. dark clouds of dense cosmic dust and gas in which star formation sometimes takes place. Astronomer Bart Bok who first suggested they may be the precursors to protostars.

What eventually forms from an egg astronomy?

Gravity pulls the cloud even more tightly together as the EGG continues to draw in material from its surroundings. As the cloud density builds up the globule becomes hotter under the weight of the outer layers, a protostar is formed inside the EGG. A protostar may have too little mass to become a star.

What happens inside a dark nebula?

Dark nebulae are interstellar clouds that contain a very high concentration of dust. The average temperature inside a dark nebula ranges from about 10 to 100 Kelvin, allowing hydrogen molecules to form and star formation to take place.