Venus beats Mercury
Nearest is not hottest.
Mercury sits closest to the Sun and averages about 170 degrees Celsius. Venus, one step further out, averages about 450. The order is not what distance predicts.
📚 Chapter Learning Kit
Earth, Our Unique Planet · Class 8 Science · Curiosity
English 5 topics 175 leveled MCQs 85 flashcards 5 games Free
Shared by a Veda teacher · Generated with Veda AI · Oct 2026
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Veda Bites are swipeable micro-lessons — each one teaches exactly one idea. Here's a taste from this kit; the app has the full deck.
How heat gets trapped
A blanket works both ways.
Sunlight passes into an atmosphere easily. The heat that the warmed surface then gives off has a much harder time getting back out through the same gases.
Two families of planet
Four and four.
Mercury, Venus, Earth and Mars are rocky: small, solid, and close to the Sun. Jupiter, Saturn, Uranus and Neptune are enormous balls of gas much further out.
The Goldilocks zone
Named after the porridge.
Around any star there is a band of distances where the temperature is neither too high nor too low for water to stay liquid. That band is the habitable zone.
Who is in the zone
Earth in, Venus out, Mars on the line.
Earth sits comfortably inside the band. Venus is too close, and whatever water it had is long gone.
Why the orbit shape counts
A circle, not a stretched loop.
Earth’s path round the Sun is very nearly a circle, so its distance barely changes and the sunlight it receives hardly varies through the year.
📖 Smart notes
What you'll study, topic by topic
1
Earth Among the Planets
Eight planets circle the Sun, four rocky and four gaseous, and the hottest is not the nearest - which is the first clue to what makes Earth liveable.
- Eight planets orbit the Sun, and only Earth is known to carry life.
- The crust is a thin outer shell, no thicker beside the whole planet than the skin on an apple.
- Mercury, Venus, Earth and Mars are rocky and have solid surfaces.
~40 min · full explanation, examples & memory tricks in the app
2
What Makes Earth Habitable
The right distance for liquid water, a nearly circular orbit, a size that holds air without crushing anything, ozone against ultraviolet, and a magnetic shield.
- The habitable or Goldilocks zone is the band of distances from a star where water can stay liquid.
- Earth lies inside the band; Venus is too close and Mars near its edge.
- There is evidence that liquid water once flowed on the Martian surface.
~50 min · full explanation, examples & memory tricks in the app
3
What Sustains Life on Earth
Air, water, solid ground and living things - four systems that keep the planet going, and the balance between them that makes it steady.
- Four systems sustain life: the atmosphere, the hydrosphere, the geosphere and the biosphere.
- The atmosphere is that envelope of gases held by gravity, where weather happens.
- Animals take oxygen and return carbon dioxide; plants do the reverse, and nitrogen builds living material.
~45 min · full explanation, examples & memory tricks in the app
4
Reproduction Keeps Life Going
Genes are instructions passed on in every cell; one parent makes exact copies and two parents make a fresh mixture, which is why life both continues and changes.
- Every individual dies, so without reproduction each kind of organism would run out.
- Genes are instructions stored in every cell and passed from parent to offspring.
- Reproduction gives both similarity to the parents and variation between offspring.
~50 min · full explanation, examples & memory tricks in the app
5
Threats to Life on Earth
Pollution, biodiversity loss and climate change - the triple planetary crisis - the agreements signed against them, and what has and has not worked.
- Pollution, biodiversity loss and climate change together are called the triple planetary crisis.
- Burning coal and oil releases greenhouse gases such as carbon dioxide and methane, which trap heat.
- Trees, plants and ocean plankton absorb carbon dioxide, but not as fast as burning releases it.
~50 min · full explanation, examples & memory tricks in the app
❓ Leveled MCQ practice
Try the smart MCQs from this kit
175 questions laddered from warm-up to topper-level, each with an explanation. A taste:
How many planets travel around the Sun?
Beginner
A Eight planets in total
B Ten planets in total
C Twelve planets in total
D Six planets in total
Show answer & explanation
Eight planets in total
Eight planets orbit the Sun, and only the third of them is known to carry life.
Which of these is not one of the rocky planets?
Beginner
A Mercury, nearest the Sun
B Jupiter, the largest planet
C Mars, just beyond Earth
D Venus, the hottest planet
Show answer & explanation
Jupiter, the largest planet
Jupiter is a gas giant. The rocky four are Mercury, Venus, Earth and Mars.
Which planet has the highest average temperature?
Beginner
A Mercury, closest to the Sun
B Jupiter, the largest of them
C Venus, second from the Sun
D Mars, the next one out
Show answer & explanation
Venus, second from the Sun
Venus averages about 450 degrees Celsius, well above Mercury’s 170, because it holds its heat.
Mercury is nearer the Sun than Venus and yet cooler. What explains that?
Intermediate
A Mercury reflects almost all the light it gets
B Venus is much larger than Mercury is
C Mercury spins much faster than Venus does
D Venus keeps its heat in a thick atmosphere
Show answer & explanation
Venus keeps its heat in a thick atmosphere
The carbon dioxide blanket on Venus slows the escape of heat, so heat accumulates there and not on bare Mercury.
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