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Challenge 55: Space Week Day 1: Stellar Classification

curriculum/challenges/english/blocks/daily-coding-challenges-python/68c1a929005bf54d342aa8d2.md

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--description--

October 4th marks the beginning of World Space Week. The next seven days will bring you astronomy-themed coding challenges.

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:

  • "O": 30,000 K or higher

  • "B": 10,000 K - 29,999 K

  • "A": 7,500 K - 9,999 K

  • "F": 6,000 K - 7,499 K

  • "G": 5,200 K - 5,999 K

  • "K": 3,700 K - 5,199 K

  • "M": 0 K - 3,699 K

  • Return the classification of the given star.

--hints--

classification(5778) should return "G".

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(classification(5778), "G")`)
}})

classification(2400) should return "M".

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(classification(2400), "M")`)
}})

classification(9999) should return "A".

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(classification(9999), "A")`)
}})

classification(3700) should return "K".

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(classification(3700), "K")`)
}})

classification(3699) should return "M".

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(classification(3699), "M")`)
}})

classification(210000) should return "O".

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(classification(210000), "O")`)
}})

classification(6000) should return "F".

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(classification(6000), "F")`)
}})

classification(11432) should return "B".

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(classification(11432), "B")`)
}})

--seed--

--seed-contents--

py
def classification(temp):

    return temp

--solutions--

py
def classification(temp):
    if temp >= 30000:
        return "O"
    elif temp >= 10000:
        return "B"
    elif temp >= 7500:
        return "A"
    elif temp >= 6000:
        return "F"
    elif temp >= 5200:
        return "G"
    elif temp >= 3700:
        return "K"
    else:
        return "M"