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The rings of Saturn are made mainly of:
APieces of ice, with some rock and dust
BSolid sheets of rock
CGlowing gases
DLiquid water
The Kármán line, widely used as the boundary between Earth’s atmosphere and outer space, is at an altitude of about:
A10 km
B100 km
C50 km
D1,000 km
Approximately how long does the International Space Station (ISS) take to complete one orbit of the Earth?
AAbout 24 hours
BAbout 12 hours
CAbout 90 minutes
DAbout 27 days
One Astronomical Unit (AU) is equal to:
AThe distance light travels in one year
BThe average distance between the Earth and the Moon
CThe average distance between the Earth and the Sun
DThe diameter of the Sun
After the Sun, which star is nearest to the Earth?
AProxima Centauri
BSirius
CPolaris
DBetelgeuse
Which is the brightest star in the night sky?
APolaris
BSirius
CVega
DRigel
Which was the world’s first artificial satellite?
AExplorer 1
BVostok 1
CApollo 11
DSputnik 1
Which is the largest moon in the solar system?
ATitan
BEuropa
CGanymede
DCallisto
Which space telescope, launched in December 2021, observes the universe mainly in infrared light?
AJames Webb Space Telescope
BHubble Space Telescope
CKepler Space Telescope
DChandra X-ray Observatory
What is the name of the visible surface of the Sun, from which most of its light is emitted?
ACorona
BPhotosphere
CChromosphere
DCore