Astronomy quiz

More questions about Astronomy

These visible examples show the question style. LearnClash turns the full topic into ranked duels and spaced repetition.

1. 1 Easy

   What is the approximate speed of light through the vacuum of space?

   Answer: 300,000 km/s

   Why: Ole Rømer first demonstrated that light has a finite speed in 1676 by observing timing shifts in eclipses of Jupiter's moon Io.

2. 2 Medium

   The Sun looks yellow from Earth. What is its true color?

   Answer: White

   Why: From space the Sun shines white; its nominal surface temperature set by the IAU is 5772 K, and it looks yellow only because our air scatters the blue away.

3. 3 Hard

   What mass limit determines if a star collapses or becomes a white dwarf?

   Answer: Chandrasekhar limit

   Why: About 1.4 solar masses. Chandrasekhar worked it out at 19 on a 1930 boat trip from India to England and won the 1983 Nobel Prize.

4. 4 Easy

   Which space telescope is best known for deep-space photos?

   Answer: Hubble Space Telescope

   Why: In 1995 Hubble stared for ten days at a blank patch the size of a tennis ball at 100 metres and found about 3000 galaxies in it.

5. 5 Medium

   What is the main message on the Voyager Golden Records?

   Answer: Sounds of Earth

   Why: Each record also carries greetings in 55 languages, 115 images and 90 minutes of music, from Bach to Chuck Berry.

6. 6 Hard

   Which moon of Saturn is known for its giant salty water geysers?

   Answer: Enceladus

   Why: Cassini flew straight through the jets, sampling salt rich ice grains, organics and phosphates, a key building block of life.