Trivia For November 25, 2025

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It's themed Tuesday! Today's questions will all be about...

The Planets

Question 1:

Due to similarities in size and mass, this planet is sometimes called Earth's twin.

Venus

  • Despite the similarities, Venus has vastly different conditions today, with a thick, toxic atmosphere and extreme temperatures, unlike the life-sustaining conditions on Earth.

Question 2:

Telescopic observations of this planet in the 19th century appeared to show long, straight lines on its surface. These were interpreted to be irrigation canals, perhaps constructed by an indigenous civilization.

Mars

  • By the early 20th century, advances in optical technology showed that the "canals" were optical illusions, and the planet had no evidence of surface water or intelligent life.

Question 3:

In 1609, Johannes Kepler discovered that planetary orbits are not circular, but rather follow what orbital path that has two foci?

Elliptical

  • The orbit of each planet in the Solar System is approximately an ellipse with the Sun at one focus point. Or to be more precise, the focus is the barycenter of the Sun–planet pair.

Question 4:

In 1977, scientists discovered a ring system around this planet. It was the second set of planetary rings observed, after Galileo saw those of Saturn in 1610.

Uranus

  • Based on the most recent photos taken in 2003–2005 by the Hubble Space Telescope, it is currently believed that there are thirteen rings around Uranus.

Question 5:

What is the densest planet in the Solar System?

Earth

  • Earth's density is measured at 5.51 g/cm³, slightly more than Mercury's density of 5.43 g/cm³. In general, terrestrial planets like Mercury, Venus, Earth and Mars, are much denser than gas giants due to their rocky composition with heavy elements like iron.

#575

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