Explanation

A star with an initial mass between 1 to 5 times the solar mass expands into a red giant and then collapses into a white dwarf.

A white dwarf is a dense, Earth-sized remnant of a star that has exhausted its nuclear fuel.

Explanation

Explanation

Magnetic lines of force always form closed loops from the north pole to the south pole outside the magnet and continue inside the magnet.

They never start or end abruptly like electric field lines.

Explanation

The product of frequency and time period is always equal to 1.

This is because frequency = 1/time period, so their product is 1.

Explanation

Helium hydride (HeH+) was the first molecule discovered in space, identified in 2019 by astronomers.

It was found in a planetary nebula, marking a significant discovery in molecular chemistry in space.