Space quiz: 10 questions

Ilustração de um balão com ponto de interrogação, Saturno e a Lua num céu estrelado

Question 7: the correct answer is 8 minutes. Did you get it right? Award yourself 1 point.

Question 8 of 10

What is the hottest planet in the Solar System?

Venus
Mercury
Mars
Jupiter

Why, in question 7: How long does sunlight take to reach Earth?

The answer is 8 minutes, more precisely about 8 minutes and 20 seconds. Light travels at nearly 300 thousand kilometers per second and must cover about 150 million kilometers.

The Solar System's ruler

The average distance between Earth and the Sun is used as a ruler by astronomers: it is the astronomical unit, about 150 million kilometers. Neptune, for example, is about 30 units from the Sun.

Because Earth's orbit is not a perfect circle, the distance varies a little over the year. Earth is closest to the Sun in early January, during the southern hemisphere's summer.

The seasons do not come from this distance, but from the tilt of Earth's axis, about 23.5 degrees, which makes each hemisphere receive more light at a different time of the year.

For stars and galaxies, astronomers use the light-year, the distance light travels in one year: about 9.5 trillion kilometers.

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