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127 lines
2.4 KiB
Markdown
127 lines
2.4 KiB
Markdown
---
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id: 68c1a929005bf54d342aa8d2
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title: "Challenge 55: Space Week Day 1: Stellar Classification"
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challengeType: 29
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dashedName: challenge-55
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---
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# --description--
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October 4th marks the beginning of World Space Week. The next seven days will bring you astronomy-themed coding challenges.
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For today's challenge, you are given the surface temperature of a star in Kelvin (K) and need to determine its stellar classification based on the following ranges:
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- `"O"`: 30,000 K or higher
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- `"B"`: 10,000 K - 29,999 K
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- `"A"`: 7,500 K - 9,999 K
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- `"F"`: 6,000 K - 7,499 K
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- `"G"`: 5,200 K - 5,999 K
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- `"K"`: 3,700 K - 5,199 K
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- `"M"`: 0 K - 3,699 K
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- Return the classification of the given star.
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# --hints--
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`classification(5778)` should return `"G"`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(classification(5778), "G")`)
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}})
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```
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`classification(2400)` should return `"M"`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(classification(2400), "M")`)
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}})
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```
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`classification(9999)` should return `"A"`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(classification(9999), "A")`)
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}})
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```
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`classification(3700)` should return `"K"`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(classification(3700), "K")`)
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}})
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```
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`classification(3699)` should return `"M"`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(classification(3699), "M")`)
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}})
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```
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`classification(210000)` should return `"O"`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(classification(210000), "O")`)
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}})
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```
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`classification(6000)` should return `"F"`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(classification(6000), "F")`)
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}})
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```
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`classification(11432)` should return `"B"`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(classification(11432), "B")`)
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}})
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```
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# --seed--
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## --seed-contents--
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```py
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def classification(temp):
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return temp
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```
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# --solutions--
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```py
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def classification(temp):
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if temp >= 30000:
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return "O"
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elif temp >= 10000:
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return "B"
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elif temp >= 7500:
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return "A"
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elif temp >= 6000:
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return "F"
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elif temp >= 5200:
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return "G"
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elif temp >= 3700:
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return "K"
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else:
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return "M"
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```
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