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README.md

This is a recreation (for the purpose of tinkering with a simplified version) of Lane Harrison’s Exoplanets interactive, which was inspired by Randall Munroe’s XKCD comic. The data is from the Planetary Habilitability Laboratory.

D3’s pack layout places circles so that they touch by default. The XKCD version however uses padding, which is more aesthetically pleasing. Fortunately, D3 2.10’s pack layout now supports padding. You could achieve a similar result through collision detection, but the pack layout is faster to compute. My implementation uses a quantize scale for color, which is my best guess to what’s used in the original, but I can’t know for sure. I make no guarantees to the accuracy of this chart. I also removed extra dimensions to reduce the size of the data file, but as a consequence I can’t show additional details on mouseover.

Test

Raw
exoplanets.csv
name radius
11 Com b 12.58
11 UMi b 12.83
14 And b 13.17
14 Her b 13.18
16 Cyg B b 13.63
18 Del b 12.84
1RXS1609 b 19.06
24 Sex b 13.55
24 Sex c 13.93
2M 044144 b 12.98
2M 0746+20 b 10.87
2M 2140+16 b 10.31
2M 2206-20 b 14.57
2M1207 b 13.25
30 Ari B b 12.86
4 Uma b 13
42 Dra b 13.26
47 Uma b 13.45
47 Uma c 14.14
47 Uma d 13.64
51 Peg b 14.28
55 Cnc b 13.95
55 Cnc c 9.19
55 Cnc d 13.33
55 Cnc e 2.17
55 Cnc f 8.4
6 Lyn b 13.53
61 Vir b 2.02
61 Vir c 5.01
61 Vir d 5.7
7 CMa b 13.43
70 Vir b 13.03
81 Cet b 13.12
91 Aqr b 13.39
AB Pic b 12.73
BD +48 738 b 13.9
BD-082823 b 4.38
BD-082823 c 14.37
BD-10 3166 b 14.2
BD-17 63 b 13.14
BD14 4559 b 13.69
BD20 2457 b 12.54
BD20 2457 c 12.76
CD-35 2722 b 12.39
CFBDS 1458 b 13.04
CHXR 73 b 12.78
CT Cha b 24.66
CoRoT-1 b 16.7
CoRoT-10 b 10.87
CoRoT-11 b 16.03
CoRoT-12 b 16.14
CoRoT-13 b 9.92
CoRoT-14 b 12.22
CoRoT-16 b 13.11
CoRoT-17 b 11.43
CoRoT-18 b 14.68
CoRoT-19 b 16.25
CoRoT-2 b 16.42
CoRoT-20 b 9.42
CoRoT-21 b 14.57
CoRoT-23 b 11.77
CoRoT-3 b 11.32
CoRoT-4 b 13.34
CoRoT-5 b 15.56
CoRoT-6 b 13.07
CoRoT-7 b 1.68
CoRoT-7 c 3.25
CoRoT-8 b 6.39
CoRoT-9 b 11.77
DH Tau b 12.81
DP Leo b 13.07
FU Tau b 12.68
Fomalhaut b 13.37
GJ 1214 b 2.75
GJ 176 b 3.26
GJ 3021 b 13.32
GJ 317 b 13.66
GJ 317 c 13.55
GJ 3634 b 2.2
GJ 433 b 2.15
GJ 433 c 8.27
GJ 436 b 4.09
GJ 667C b 2.09
GJ 667C c 1.86
GJ 674 b 3.92
GJ 676A b 13.25
GJ 832 b 14.06
GQ Lup b 20.18
GSC 06214-00210 b 12.63
Gj 849 b 13.87
Gl 179 b 13.95
Gl 581 b 4.65
Gl 581 c 2.08
Gl 581 d 2.2
Gl 581 e 1.34
Gl 649 b 14.38
Gl 86 b 13.24
Gliese 876 b 13.56
Gliese 876 c 14.08
Gliese 876 d 2.15
Gliese 876 e 4.09
HAT-P-1 b 13.64
HAT-P-11 b 5.07
HAT-P-12 b 10.75
HAT-P-13 b 14.35
HAT-P-13 c 12.7
HAT-P-14 b 13.45
HAT-P-15 b 12.02
HAT-P-16 b 14.45
HAT-P-17 b 11.32
HAT-P-17 c 13.71
HAT-P-18 b 11.15
HAT-P-19 b 12.69
HAT-P-2 b 10.66
HAT-P-20 b 9.72
HAT-P-21 b 11.48
HAT-P-22 b 12.11
HAT-P-23 b 15.33
HAT-P-24 b 13.92
HAT-P-25 b 13.34
HAT-P-26 b 6.33
HAT-P-27/WASP-40 b 11.83
HAT-P-28 b 13.59
HAT-P-29 b 12.41
HAT-P-3 b 9.27
HAT-P-30/WASP-51 b 15.02
HAT-P-31 b 11.99
HAT-P-32 b 22.83
HAT-P-33 b 20.48
HAT-P-34 b 12.41
HAT-P-35 b 14.93
HAT-P-36 b 14.17
HAT-P-37 b 13.2
HAT-P-38 b 9.25
HAT-P-4 b 14.24
HAT-P-5 b 14.03
HAT-P-6 b 14.91
HAT-P-7 b 15.93
HAT-P-8 b 16.81
HAT-P-9 b 15.69
HATS-1 b 14.59
HD 100655 b 13.62
HD 100777 b 13.79
HD 10180 c 4.17
HD 10180 d 3.92
HD 10180 e 6
HD 10180 f 5.84
HD 10180 g 5.49
HD 10180 h 10.17
HD 101930 b 14.42
HD 102117 b 9.28
HD 102195 b 14.23
HD 102272 b 13.08
HD 102272 c 13.43
HD 102329 b 13.08
HD 102365 b 4.65
HD 102956 b 13.88
HD 103197 b 6.77
HD 104067 b 9.69
HD 104985 b 13.05
HD 106252 b 13.03
HD 106270 b 12.81
HD 10647 b 13.89
HD 106515A b 12.83
HD 10697 b 13.11
HD 107148 b 10.37
HD 108147 b 11.72
HD 108863 b 13.43
HD 108874 b 13.72
HD 108874 c 13.85
HD 109246 b 13.98
HD 109749 b 14.45
HD 110014 b 12.81
HD 111232 b 13.02
HD 113538 b 11.94
HD 113538 c 14.02
HD 114386 b 13.76
HD 114386 c 13.78
HD 114729 b 13.94
HD 114762 b 12.81
HD 114783 b 13.93
HD 11506 b 13.31
HD 11506 c 13.95
HD 116029 b 13.53
HD 117207 b 13.54
HD 117618 b 9.46
HD 118203 b 13.52
HD 11964 b 14.08
HD 11964 c 6
HD 11977 b 13.03
HD 121504 b 13.77
HD 122430 b 13.28
HD 125595 b 4.21
HD 125612 b 13.37
HD 125612 c 5.05
HD 125612 d 12.99
HD 126525 b 10.76
HD 12661 b 13.49
HD 12661 c 13.66
HD 126614 b 14.31
HD 128311 b 13.51
HD 128311 c 13.4
HD 129445 b 13.65
HD 130322 b 13.92
HD 131496 b 13.51
HD 13189 b 12.71
HD 132406 b 13.1
HD 132563B b 13.68
HD 134060 b 3.81
HD 134060 c 8.62
HD 134606 b 3.44
HD 134606 c 4
HD 134606 d 7.62
HD 134987 b 13.65
HD 134987 c 13.95
HD 136352 b 2.06
HD 136352 c 3.85
HD 136352 d 3.49
HD 136418 b 13.55
HD 137388 b 10.73
HD 13808 b 3.65
HD 13808 c 3.86
HD 13931 b 13.58
HD 139357 b 12.86
HD 141937 b 12.87
HD 142 b 13.76
HD 142 c 13.12
HD 142022 A b 13.2
HD 142245 b 13.57
HD 142415 b 13.64
HD 143361 b 13.35
HD 145377 b 13.09
HD 145457 b 13.39
HD 1461 b 2.49
HD 1461 c 2.18
HD 147018 b 13.52
HD 147018 c 13.03
HD 147513 b 13.77
HD 148156 b 13.93
HD 148427 b 13.88
HD 149026 b 8.05
HD 149143 b 13.72
HD 1502 b 13.36
HD 150433 b 9.16
HD 150706 b 13.42
HD 152079 b 13.37
HD 152581 b 13.68
HD 153950 b 13.41
HD 154088 b 2.22
HD 154345 b 13.93
HD 154672 b 13.15
HD 154857 b 13.6
HD 155358 b 13.93
HD 155358 c 13.95
HD 156279 b 12.87
HD 156411 b 14
HD 156668 b 1.84
HD 157172 b 7.58
HD 158038 b 13.6
HD 159868 b 13.53
HD 159868 c 14
HD 16141 b 10.51
HD 16175 b 13.2
HD 162020 b 12.7
HD 163607 b 13.98
HD 163607 c 13.49
HD 16417 b 5.56
HD 164509 b 14.2
HD 164604 b 13.42
HD 164922 b 14.33
HD 166724 b 13.23
HD 167042 b 13.65
HD 168443 b 12.97
HD 168443 c 12.69
HD 168746 b 10.92
HD 1690 b 13.06
HD 169830 b 13.39
HD 169830 c 13.24
HD 170469 b 14.04
HD 17092 b 13.18
HD 171028 b 13.55
HD 171238 b 13.43
HD 17156 b 12.27
HD 173416 b 13.42
HD 175167 b 12.96
HD 175541 b 14.09
HD 176051 b 13.68
HD 177830 b 13.68
HD 177830 c 8.59
HD 178911 B b 13.05
HD 179079 b 6.04
HD 179949 b 13.88
HD 180314 b 12.53
HD 180902 b 13.65
HD 181342 b 13.33
HD 181433 b 2.48
HD 181433 c 14.06
HD 181433 d 14.14
HD 181720 b 14.39
HD 183263 b 13.28
HD 183263 c 13.27
HD 185269 b 13.89
HD 187085 b 13.99
HD 187123 b 14.16
HD 187123 c 13.55
HD 18742 b 13.42
HD 188015 b 13.76
HD 189567 b 3.59
HD 189733 b 12.76
HD 190360 b 13.68
HD 190360 c 5
HD 190647 b 13.57
HD 190984 b 13.36
HD 192263 b 14
HD 192310 b 4.8
HD 192310 c 5.83
HD 192699 b 13.45
HD 195019 b 13.28
HD 196050 b 13.4
HD 196067 b 13
HD 196885 A b 13.37
HD 197037 b 13.97
HD 19994 b 13.63
HD 20003 b 3.97
HD 20003 c 4.22
HD 200964 b 13.58
HD 200964 c 13.91
HD 202206 b 12.62
HD 202206 c 13.46
HD 20367 b 13.83
HD 2039 b 13.16
HD 204313 b 13.3
HD 204313 c 4.85
HD 204313 d 13.63
HD 204941 b 11.84
HD 205739 b 13.72
HD 206610 b 13.51
HD 20781 b 3.98
HD 20781 c 4.62
HD 20782 b 13.57
HD 20794 b 1.52
HD 20794 c 1.46
HD 20794 d 1.96
HD 208487 b 14.27
HD 20868 b 13.55
HD 209458 b 15.47
HD 210277 b 13.77
HD 210702 b 13.55
HD 212301 b 14.23
HD 212771 b 13.49
HD 213240 b 13.19
HD 215152 b 1.54
HD 215152 c 1.61
HD 215456 b 6.89
HD 215456 c 11.34
HD 215497 b 2.26
HD 215497 c 14.37
HD 216435 b 13.76
HD 216437 b 13.59
HD 216770 b 14.06
HD 21693 b 3.63
HD 21693 c 5.37
HD 217107 b 13.73
HD 217107 c 13.45
HD 217786 b 12.74
HD 218566 b 10.37
HD 219828 b 5.43
HD 220689 b 13.78
HD 220773 b 13.69
HD 221287 b 13.36
HD 222155 b 13.57
HD 222582 b 12.96
HD 224693 b 14.02
HD 22781 b 12.72
HD 23079 b 13.45
HD 23127 b 13.68
HD 231701 b 13.83
HD 23596 b 12.94
HD 240210 b 13.01
HD 240237 b 13.12
HD 24040 b 13.24
HD 25171 b 13.88
HD 2638 b 14.2
HD 27442 b 13.72
HD 27631 b 13.62
HD 27894 b 14.08
HD 28185 b 13.09
HD 28254 b 13.79
HD 28678 b 13.62
HD 290327 b 13.44
HD 30177 b 12.96
HD 30562 b 13.75
HD 30856 b 13.6
HD 31253 b 14.18
HD 31527 b 3.88
HD 31527 c 4.63
HD 31527 d 4.74
HD 32518 b 13.36
HD 330075 b 14.08
HD 33142 b 13.74
HD 33283 b 14.37
HD 33564 b 12.89
HD 34445 b 13.97
HD 3651 b 9.31
HD 37124 b 14.04
HD 37124 c 14.06
HD 37124 d 14.03
HD 37605 b 13.4
HD 37605 c 13.32
HD 38283 b 14.36
HD 38529 b 14.04
HD 38529 c 12.67
HD 38801 b 12.82
HD 38858 b 6.7
HD 39091 b 12.84
HD 39194 b 1.75
HD 39194 c 2.18
HD 39194 d 2.03
HD 40307 b 1.84
HD 40307 c 2.35
HD 40307 d 3.41
HD 40979 b 13.33
HD 41004 A b 13.44
HD 41004 B b 12.6
HD 4113 b 13.66
HD 4203 b 13.53
HD 4208 b 13.96
HD 4308 b 4.13
HD 4313 b 13.49
HD 43197 b 14.09
HD 43691 b 13.45
HD 44219 b 14.11
HD 45184 b 4.1
HD 45350 b 13.6
HD 45364 b 9.73
HD 45364 c 14.05
HD 45652 b 14.21
HD 46375 b 11.41
HD 47186 b 5.68
HD 47186 c 14.34
HD 47536 b 13.15
HD 47536 c 13
HD 48265 b 13.79
HD 49674 b 7.41
HD 50499 b 13.62
HD 50554 b 13.13
HD 51608 b 4.17
HD 51608 c 4.97
HD 52265 b 13.84
HD 5319 b 13.56
HD 5891 b 12.97
HD 59686 b 13.13
HD 60532 b 13.41
HD 60532 c 13.04
HD 62509 b 13.39
HD 63454 b 14.31
HD 63765 b 14.06
HD 6434 b 14.29
HD 65216 b 13.77
HD 65216 c 13.5
HD 66428 b 13.4
HD 6718 b 13.66
HD 68988 b 13.57
HD 69830 b 3.4
HD 69830 c 3.68
HD 69830 d 4.66
HD 70573 b 13.06
HD 70642 b 13.55
HD 7199 b 14.43
HD 72659 b 13.35
HD 73256 b 13.58
HD 73267 b 13.36
HD 73526 b 13.39
HD 73526 c 13.45
HD 73534 b 13.8
HD 74156 b 13.58
HD 74156 c 12.95
HD 7449 b 13.81
HD 7449 c 13.55
HD 75289 b 14.26
HD 75898 b 13.45
HD 76700 b 10.01
HD 7924 b 3.42
HD 79498 b 13.73
HD 80606 b 10.32
HD 81040 b 13.01
HD 81688 b 13.42
HD 82886 b 13.74
HD 82943 b 13.61
HD 82943 c 13.55
HD 83443 b 14.28
HD 8535 b 14.04
HD 85390 b 8
HD 85512 b 1.7
HD 8574 b 13.53
HD 86081 b 13.68
HD 86226 b 13.68
HD 86264 b 13
HD 8673 b 12.71
HD 87883 b 12.83
HD 88133 b 10.65
HD 89307 b 13.55
HD 89744 b 13.05
HD 90156 b 5
HD 92788 b 13.32
HD 93083 b 14.32
HD 93385 b 3.24
HD 93385 c 3.61
HD 9446 b 14.02
HD 9446 c 13.59
HD 95089 b 13.78
HD 9578 b 14.08
HD 96063 b 13.91
HD 96127 b 13.25
HD 96167 b 14.04
HD 96700 b 3.38
HD 96700 c 4.1
HD 97658 b 2.94
HD 98219 b 13.6
HD 98649 b 13
HD 99109 b 14.18
HD 99492 b 7.19
HD 99492 c 14.33
HD 99706 b 13.71
HIP 11952 b 13.38
HIP 11952 c 13.97
HIP 12961 b 14.35
HIP 13044 b 13.76
HIP 14810 b 13.26
HIP 14810 c 13.75
HIP 14810 d 14.12
HIP 5158 b 13.7
HIP 5158 c 12.68
HIP 57050 b 14.42
HIP 57274 b 3.86
HIP 57274 c 14.27
HIP 57274 d 14.15
HIP 70849 b 12.9
HIP 75458 b 12.97
HIP 78530 b 12.51
HIP 79431 b 13.53
HN Peg b 12.33
HR 810 b 13.5
HR 8799 b 12.33
HR 8799 c 14.57
HR 8799 d 13.45
HR 8799 e 12.9
HU Aqr(AB) c 13.08
HW Vir (AB) b 12.7
KELT-2A b 14.64
KIC 10905746 b 2.66
KIC 6185331 b 8.07
KOI-13 b 20.51
KOI-135 b 13.45
KOI-196 b 9.43
KOI-200 b 8.86
KOI-202 b 11.43
KOI-204 b 13.9
KOI-206 b 7.85
KOI-254 b 10.76
KOI-423 b 13.67
KOI-428 b 13.11
KOI-55 b 0.76
KOI-55 c 0.87
KOI-680 b 7.29
KOI-730 b 3.47
KOI-730 c 2.58
KOI-730 d 2.8
KOI-730 e 2.02
KOI-872 b 9.1
KOI-872 c 14.38
Kepler-10 b 1.42
Kepler-10 c 2.23
Kepler-11 b 1.98
Kepler-11 c 3.16
Kepler-11 d 3.44
Kepler-11 e 4.53
Kepler-11 f 2.62
Kepler-11 g 3.67
Kepler-12 b 19
Kepler-14 b 12.73
Kepler-15 b 10.76
Kepler-16 (AB) b 8.45
Kepler-17 b 14.71
Kepler-18 b 2.01
Kepler-18 c 5.49
Kepler-18 d 6.95
Kepler-19 b 2.22
Kepler-20 b 1.91
Kepler-20 c 3.03
Kepler-20 d 2.8
Kepler-20 e 0.87
Kepler-20 f 1.01
Kepler-21 b 1.64
Kepler-22 b 2.1
Kepler-23 b 1.91
Kepler-23 c 3.25
Kepler-24 b 2.35
Kepler-24 c 2.8
Kepler-25 b 2.58
Kepler-25 c 4.48
Kepler-26 b 3.59
Kepler-26 c 3.59
Kepler-27 b 4.04
Kepler-27 c 4.93
Kepler-28 b 3.59
Kepler-28 c 3.36
Kepler-29 b 3.59
Kepler-29 c 2.91
Kepler-30 b 3.7
Kepler-30 c 14.46
Kepler-30 d 10.76
Kepler-31 b 4.26
Kepler-31 c 4.26
Kepler-32 b 4.15
Kepler-32 c 3.7
Kepler-33 b 1.79
Kepler-33 c 3.25
Kepler-33 d 5.38
Kepler-33 e 4.04
Kepler-33 f 4.48
Kepler-34(AB) b 8.56
Kepler-35(AB) b 8.16
Kepler-4 b 4
Kepler-42 b 0.78
Kepler-42 c 0.73
Kepler-42 d 0.57
Kepler-5 b 16.04
Kepler-6 b 14.83
Kepler-7 b 18.09
Kepler-8 b 15.91
Kepler-9 b 9.44
Kepler-9 c 9.23
Kepler-9 d 1.65
LKCA 15 b 13.07
MOA-2007-BLG-192-L b 1.63
MOA-2007-BLG-400-L b 13.91
MOA-2008-BLG-310-L b 10.92
MOA-2009-BLG-266L b 3.66
MOA-2009-BLG-319 b 8.82
MOA-2009-BLG-387L b 13.43
MOA-2010-BLG-477L b 13.68
MOA-2011-BLG-293L b 13.47
MOA-bin-1 b 13.28
NGC 2423 3 b 12.83
NGC 4349 No 127 b 12.57
NN Ser (ab) c 13.01
NN Ser (ab) d 13.49
NY Vir b 13.49
OGLE-05-071L b 13.3
OGLE-05-169L b 4.1
OGLE-05-390L b 2.08
OGLE-06-109L b 14.07
OGLE-06-109L c 11.04
OGLE-2007-BLG-368L b 5.58
OGLE-TR-10 b 19.28
OGLE-TR-111 b 12.07
OGLE-TR-113 b 12.44
OGLE-TR-132 b 13.79
OGLE-TR-182 b 16.48
OGLE-TR-211 b 14.12
OGLE-TR-56 b 13.45
OGLE2-TR-L9 b 18.09
OGLE235-MOA53 b 13.43
Oph 11 b 12.54
PSR 1257 12 b 0.31
PSR 1257 12 c 1.72
PSR 1257 12 d 1.66
PSR 1719-14 b 4.48
PSR B1620-26 b 13.45
Qatar-1 b 13.05
Qatar-2 b 12.82
RR Cae b 13.22
Ross 458(AB) c 12.92
SR 12 AB c 12.74
SWEEPS-04 9.08
SWEEPS-11 12.67
TrES-1 12.32
TrES-2 13.1
TrES-3 14.63
TrES-4 19.12
TrES-5 13.55
UScoCTIO 108 b 12.66
UZ For(ab) d 12.96
V391 Peg b 13.34
WASP-1 b 16.63
WASP-10 b 12.11
WASP-11/HAT-P-10 b 11.71
WASP-12 b 19.46
WASP-13 b 15.3
WASP-14 b 14.36
WASP-15 b 16.01
WASP-16 b 11.3
WASP-17 b 22.32
WASP-18 b 13.06
WASP-19 b 15.54
WASP-2 b 12.09
WASP-20 b 10.09
WASP-21 b 13.56
WASP-22 b 12.98
WASP-23 b 10.78
WASP-24 b 12.37
WASP-25 b 14.12
WASP-26 b 14.36
WASP-28 b 12.55
WASP-29 b 8.88
WASP-3 b 16.3
WASP-31 b 17.23
WASP-32 b 13.23
WASP-33 b 16.12
WASP-34 b 13.67
WASP-35 b 14.8
WASP-36 b 14.22
WASP-37 b 12.73
WASP-38 b 12.09
WASP-39 b 14.24
WASP-4 b 15.28
WASP-41 b 13.56
WASP-42 b 12.11
WASP-43 b 11.61
WASP-44 b 12.78
WASP-45 b 13
WASP-46 b 14.68
WASP-47 b 12.89
WASP-48 b 18.72
WASP-49 b 12.5
WASP-5 b 13.13
WASP-50 b 12.92
WASP-52 b 14.57
WASP-53 b 13.45
WASP-54 b 15.69
WASP-55 b 14.57
WASP-56 b 13.45
WASP-57 b 12.33
WASP-58 b 14.57
WASP-59 b 10.09
WASP-6 b 13.72
WASP-60 b 10.09
WASP-61 b 13.9
WASP-62 b 15.58
WASP-63 b 16.03
WASP-64 b 7.85
WASP-65 b 14.57
WASP-66 b 15.58
WASP-67 b 15.69
WASP-68 b 10.09
WASP-69 b 11.21
WASP-7 b 14.91
WASP-70 b 8.97
WASP-78 b 19.62
WASP-79 b 19.06
WASP-8 b 11.63
WD 0806-661B b 12.95
XO-1 b 13.27
XO-2 b 10.91
XO-3 b 13.64
XO-4 b 15.02
XO-5 b 11.55
alf Ari b 13.6
beta Pic b 13.01
eps Eridani b 13.73
eps Tau b 12.97
gamma 1 Leo b 12.97
gamma Cephei b 13.65
kappa CrB b 13.6
ksi Aql b 13.4
mu Ara b 13.63
mu Ara c 3.69
mu Ara d 14.16
mu Ara e 13.59
nu Oph b 12.52
nu Oph c 12.48
tau Boo b 13.26
tau Gem b 12.61
ups And b 14.1
ups And c 12.76
ups And d 12.91
ups And e 13.83
Raw
index.html
<!DOCTYPE html>
<meta charset="utf-8">
<title>Exoplanets</title>
<body>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script>
var color = d3.scale.quantize()
.range(["#156b87", "#876315", "#543510", "#872815"]);
var size = 960;
var pack = d3.layout.pack()
.sort(null)
.size([size, size])
.value(function(d) { return d.radius * d.radius; })
.padding(1.5);
var svg = d3.select("body").append("svg")
.attr("width", size)
.attr("height", size);
d3.csv("exoplanets.csv", function(error, exoplanets) {
exoplanets.forEach(function(d) { d.radius = +d.radius; });
color.domain(d3.extent(exoplanets, function(d) { return d.radius; }));
svg.selectAll("circle")
.data(pack.nodes({children: exoplanets}).slice(1))
.enter().append("circle")
.attr("r", function(d) { return d.r; })
.attr("cx", function(d) { return d.x; })
.attr("cy", function(d) { return d.y; })
.style("fill", function(d) { return color(d.radius); })
.append("title")
.text(function(d) { return d.name; });
});
d3.select(self.frameElement).style("height", size + "px");
</script>
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