What is Light? Maxwell and the Electromagnetic Spectrum

Color and Refraction

NASA - Tour of the Electromagnetic Spectrum

The Attribute of Light Science Still Can't Explain

Absorption, Line, Emission and Continuous Spectra

The Formation of the Solar System and the Structure of the Sun

Introduction to Heliophysics

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Sun 101 | National Geographic

How the Sun Shines: The Nuclear Reactions that Power the Sun

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Dark Secrets of the Sun NOVA Special Universe Documentary

When A Solar Storm Engulfs Earth

General Astronomy Test - Types of Spectra

Insert the missing elements (marked by sign "?") in the sequences shown, making assumptions about the rules for forming these sequences.

0    1    2    3    4    ?    6    7    8    9
a    b    c    d    e    ?    g    h    i    j
0    2    4    6    8    ?    12    14    16    18
0    1    4    9    16    ?    36    49    64    81
0    3    6    9    12    ?    18    21    24    27
0    -2    -2    0    4    ?    18    28    40    54
Su    Mo    Tu    We    Th    ?    Sa
z    o    t    t    f    ?    s    s    e    n
1    0    0    0    1    ?    1    0    2    1
M    V    E    M    J    ?    U    N
c    u    d    t    c    ?    s    s    o    n
0    1    3    6    10    ?    21    28    36    45
r    o    y    g    ?    i    v
1    1    2    6    24    ?    720    5040    40320    362880
1    9    36    ?    126    126    ?    36    9 1
G    X    U    V    I    ?    R    L
da    h    k    M    G    ?    P    E    Z    Y
d    c    m    μ    n    ?    f    a    z    y
o    t    h    t    m    ?    t    q    q    s