How can a planetary nebula be identified? Select the two correct answers. (1 point)

Question

diffuse edges
dark area
central star remnant
spherical shape

What does it mean to characterize a nebula as diffuse? (1 point)
Its edges do not have clear boundaries.
Its edges have clear boundaries.
It reflects only non-visible radiation.
It reflects only visible radiation
How are nebulae and stars related? Select the three correct answers. (2 points)
Stars are pulled toward nebulae.
Nebulae form from stars.
Nebulae are found inside stars.
Nebulae explode to form stars.
Stars form from nebulae.
Stars explode to form nebulae.

What causes a supernova? (1 point)
O force of a nebula
O force of gravity
O energy of a nebula
energy of heat

Answer 1

The correct answers are:
1) central star remnant and 2) spherical shape

Characterizing a nebula as diffuse means that its edges do not have clear boundaries.

The correct answers regarding the relationship between nebulae and stars are:
1) Nebulae form from stars,
2) Stars form from nebulae, and
3) Stars explode to form nebulae.

The cause of a supernova is the force of gravity.