Which planet is closest to the Sun?
AnswerMercury
Mercury orbits closest to the Sun.
Science · Facts & stats
Science facts & stats
7 fact-checked facts about everyday science, from physics to biology, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
Which gas do plants take in for photosynthesis?
AnswerCarbon dioxide
Plants absorb carbon dioxide and release oxygen.
Going deeper
Which gas makes up most of Earth's atmosphere?
AnswerNitrogen
Nitrogen is about 78 percent of the air.
What is the pH of pure water at 25 C?
Answer7
Pure water is neutral, with a pH of 7.
About how fast does light travel in a vacuum?
Answer300,000 km per second
Light travels about 299,792 km per second.
Expert level
What is absolute zero in degrees Celsius?
Answer-273.15 C
Absolute zero is 0 kelvin, or -273.15 C (-459.67 is the Fahrenheit value).
In what year was the double helix structure of DNA published?
Answer1953
Watson and Crick published the double helix model in 1953.
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