What's this?
goggles
What's this?
towel
What is he doing?
He is sunbathing (sunbathe)
Who is this?
an astronaut
What's this?
sunscreen
What’s this?
a rocket
What's this?
a spacesuit
What is she doing?
She is packing her suitcase
What's this?
a space station
What's this?
a telescope
What's this?
a planet/planets
What's this?
an alien
What's this?
a comet
What is she doing?
She is going sightseeing
What are they doing?
They are going hiking.