How can a planetary nebula be identified? Select the two correct answers. (1 point)
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
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.
The correct answers are:
1. How can a planetary nebula be identified? Select the two correct answers:
- Diffuse edges
- Spherical shape
2. What does it mean to characterize a nebula as diffuse? (1 point)
- Its edges do not have clear boundaries.
3. How are nebulae and stars related? Select the three correct answers. (2 points)
- Nebulae form from stars.
- Stars form from nebulae.
- Stars explode to form nebulae.
4. What causes a supernova? (1 point)
- Force of gravity.
To identify a planetary nebula, the correct answers are a spherical shape and a central star remnant. Planetary nebulae are formed when a dying star sheds its outer layers, creating a glowing shell of gas that surrounds a central white dwarf star.
Characterizing a nebula as diffuse means that its edges do not have clear boundaries. A diffuse nebula is a cloud of interstellar gas and dust that scatters and absorbs visible light, causing it to appear hazy and lacking in distinct edges.
Nebulae and stars are related in the following ways: Nebulae form from stars, stars form from nebulae, and stars explode to form nebulae. Nebulae are the birthplaces of stars, as the gas and dust in a nebula can collapse under gravity to form new star systems. On the other hand, when massive stars reach the end of their lives, they can explode in a supernova, dispersing their outer layers into space and creating a nebula.
A supernova is caused by the force of gravity. When a massive star runs out of fuel for nuclear fusion in its core, gravity takes over and causes the core to collapse. The resulting explosion releases an enormous amount of energy and creates a supernova, which is an extremely bright and powerful stellar event.