Question

the table shows chronological events in the life of our sun, a medium - sized star. place the missing events into the correct rows of the table.
the sun is a white dwarf with a dim glow.
a nebula located in the milky way galaxy begins pulling nearby hydrogen atoms into its orbit.
the temperature in the core of the nebula reaches 14 million kelvin.
the sun expands greatly and cools. it is larger and redder.
1
the nebula shrinks in volume due to gravity, becoming denser and hotter. but, its not hot enough for nuclear fusion.
2
6 hydrogen runs low.
7
the sun completely runs out of hydrogen to fuse. its outer layers are pushed away, and a cloud of ionized gas surrounds its core.
8
3

Explanation:

Step1: Star - formation start

The first event in the life - cycle of a star like the Sun is when a nebula in the Milky Way galaxy starts pulling nearby hydrogen atoms into its orbit. So, for row 1, the answer is "A nebula located in the Milky Way galaxy begins pulling nearby hydrogen atoms into its orbit."

Step2: Temperature rise for fusion

As the nebula shrinks due to gravity (already given in row 2), the next step is when the temperature in the core of the nebula reaches 14 million Kelvin, which is the temperature required for nuclear fusion to start. So, for row 3, the answer is "The temperature in the core of the nebula reaches 14 million Kelvin."

Step3: Red - giant phase

When hydrogen runs low (row 6), the Sun enters the red - giant phase. In this phase, the Sun expands greatly and cools, becoming larger and redder. So, for row 7, the answer is "The Sun expands greatly and cools. It is larger and redder."

Step4: White - dwarf stage

After the Sun completely runs out of hydrogen to fuse and its outer layers are pushed away (row 8), it becomes a white dwarf with a dim glow. So, there is no specific row number given for the last event, but the final stage is "The Sun is a white dwarf with a dim glow."

Answer:

1. A nebula located in the Milky Way galaxy begins pulling nearby hydrogen atoms into its orbit.
2. The temperature in the core of the nebula reaches 14 million Kelvin.
3. The Sun expands greatly and cools. It is larger and redder.

Final stage: The Sun is a white dwarf with a dim glow.