A protostar has a high enough density and temperature to become a star.
A protostar undergoes a process of gravitational contraction from a dense molecular cloud, accumulating mass and increasing its density. As the protostar contracts, gravitational potential energy is converted into thermal energy, leading to a rise in temperature at its core. When the temperature reaches approximately 10 million Kelvin, nuclear fusion reactions of hydrogen atoms begin, producing helium and releasing an immense amount of energy. This energy generation counteracts the gravitational collapse, establishing a balance known as hydrostatic equilibrium. At this stage, the protostar transitions into a main sequence star, where it continues to burn hydrogen fuel in its core, emitting light and heat. Thus, a protostar must achieve a high enough density and temperature to sustain nuclear fusion and initiate its lifecycle as a star.
What are three things you should do when targeting possible employment opportunities?
Which of these taxes helps provide health insurance for people who are retired or disabled?
Answer: FICA Tax
Explanation:
The author’s purpose of this speech is to inform listeners about the history of Earth Day. inform listeners about Pine Grove High’s boundaries. persuade listeners to participate in an Earth Day event. persuade listeners of the threat of an energy crisis.
C persuade listeners to participate in an earth day event
Paul had 96 fliers to post around town. Last week, he posted 16 of them. This week, he posted 38 of the remaining fliers. How many fliers has he still not posted?
What type of cartilage is found on the outer border of the spine?
Fibrocartilage is the type of cartilage located on the outer border of the spine, making up the intervertebral discs which provide support and flexibility to the spinal column.
Explanation:The type of cartilage found on the outer border of the spine is known as fibrocartilage. This type of cartilage is distinguished by its substantial content of type I collagen fibers, giving it significant strength. It is typically found in areas subject to intense pressures and high tensile strength, such as the locations where tendons attach to bones, the intervertebral discs, and the symphysis between certain bones. In the vertebrae, fibrocartilage makes up the intervertebral discs that lie between adjacent vertebral bodies from the second cervical vertebra to the sacrum. These discs function not only as a type of fibrous joint that permits some movement in the spine but also as cushions that absorb shock from activities like walking and running.
The weighted credit for a B+ average in a weight class is
Answer:4.0
Explanation: