Simplify the following text for a Grade 5 native English-speaking person.
Original: If a white dwarf has a close companion star that overflows its Roche lobe , the white dwarf will steadily accrete gases from the star 's outer atmosphere .
Simplified: Sometimes a star is in orbit around a white dwarf star . If it is large enough and close enough to the white dwarf , the dwarf may suck gasses from its companion 's atmosphere .