Stars and galaxies - Free MCQ Practice Test with solutions, Class 8 Year

Giant molecular clouds, also known as stellar nurseries, are primarily composed of hydrogen gas, which collapses under gravity to form stars, as described in the star formation process.

After the protostar stage, a star begins nuclear fusion in its core, entering the main sequence phase, where it spends most of its life fusing hydrogen into helium, as outlined in the star formation process.

The Sun is a yellow dwarf star, a medium-sized star in the main sequence phase, as described in the content about the Sun.

The Andromeda Galaxy (M31) is the closest spiral galaxy to the Milky Way and can be seen with the naked eye under dark skies, as noted in the content about the Andromeda Galaxy.

Stars generate energy through nuclear fusion in their cores, where hydrogen atoms fuse to form helium. This process releases enormous amounts of energy that powers the star.

The Orion Nebula is a stellar nursery in the Milky Way where new stars are actively forming.

Elliptical galaxies are typically large and contain a vast number of stars. They have a more rounded or elliptical shape compared to spiral or irregular galaxies.

The Milky Way is a barred spiral galaxy containing our solar system, with a central bulge and spiral arms, as described in the content about the Milky Way.

A supernova is a powerful explosion that occurs at the end of the life cycle of a massive star. It releases a tremendous amount of energy and can briefly outshine entire galaxies.

A star like the Sun ends its life cycle as a white dwarf after passing through the red giant phase, as explained in the content about the life cycle of stars.