def color(teffs):
    """
    Conventional color descriptions of stars.
    Source: https://en.wikipedia.org/wiki/Stellar_classification
    """
    colors = []
    for t in teffs:
        if t >= 7500:
            colors.append('blue_white')
        elif t >= 6000:
            colors.append('white')
        elif t >= 5200:
            colors.append('yellowish_white')
        elif t >= 3700:
            colors.append('pale_yellow_orange')
        else:
            colors.append('light_orange_red')
    return colors
