Basically, all of them.
astronmer
telescope,radio telescope
planet pluto
Helen Sawyer Hogg is known for being an astronmer
The Little Prince saw 44 sunsets on his planet before leaving to explore other galaxies.
who discovered the galaxies who discovered the galaxies
Spiral galaxies, barred spiral galaxies, elliptical galaxies, and irregular galaxies
The possessive form for the plural noun galaxies is galaxies'.Example: Their galaxies' paths do not coordinate.
Elliptical galaxies are sometime called dwarf galaxies.
15 Galaxies? There are over 1,000,000,000 galaxies possibly more.
no galaxies are not harmful
spiral galaxies (ours), irregular galaxies, and elliptical galaxies.