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The Nearest Stars, Brown Dwarfs, and White Dwarfs
Star System Discovery Name Distance (light-year) Spectral Type Location: RA Location (right ascension) given for Epoch 2000.0 Location: Dec Location (declination) given for Epoch 2000.0 Luminosity (Sun = 1)
Sun G2 V 1
1 1 Proxima Centauri 4.2 M5.5 V 14 29 −62 40 5 × 10 −5
2 2 Alpha Centauri A 4.4 G2 V 14 39 −60 50 1.5
3 Alpha Centauri B 4.4 K2 IV 14 39 −60 50 0.5
4 3 Barnard’s Star 6.0 M4 V 17 57 +04 42 4.4 × 10 −4
5 4 Wolf 359 7.8 M6 V 10 56 +07 00 2 × 10 −5
6 5 Lalande 21 185 8.3 M2 V 11 03 +35 58 5.7 × 10 −3
7 6 Sirius A 8.6 A1 V 06 45 −16 42 23.1
8 Sirius B 8.6 DA2 White dwarf stellar remnant 06 45 −16 43 2.5 × 10 −3
9 7 Luyten 726-8 A 8.7 M5.5 V 01 39 −17 57 6 × 10 −5
10 Luyten 726-8 B (UV Ceti) 8.7 M6 V 01 39 −17 57 4 × 10 −5
11 8 Ross 154 9.7 M.05 V 18 49 −23 50 5 × 10 −4
12 9 Ross 248 (HH Andromedae) 10.3 M5.5 V 23 41 +44 10 1.0 × 10 −4
13 10 Epsilon Eridani 10.5 K2 V 03 32 −09 27 0.29
14 11 Lacaille 9352 10.7 M0.5 V 23 05 −35 51 0.011
15 12 Ross 128 (FI Virginis) 10.9 M4 V 11 47 +00 48 3.4 × 10 −4
16 13 Luyten 789-6 A (EZ Aquarii A) 11.3 M5 V 22 38 −15 17 5 × 10 −5
17 Luyten 789-6 B (EZ Aquarii B) 11.3 M5.5 V 22 38 −15 15 5 × 10 −5
18 Luyten 789-6 C (EZ Aquarii C) 11.3 M6.5 V 22 38 −15 17 2 × 10 −5
19 14 61 Cygni A 11.4 K5 V 21 06 +38 44 0.086
20 61 Cygni B 11.4 K7 V 21 06 +38 44 0.041
21 15 Procyon A 11.4 F51V 07 39 +05 13 7.38
22 Procyon B 11.4 wd White dwarf stellar remnant 07 39 +05 13 5.5 × 10 −4
23 16 Sigma 2398 A 11.5 M3 V 18 42 +59 37 0.003
24 Sigma 2398 B 11.5 M3.5 V 18 42 +59 37 1.4 × 10 −3
25 17 Groombridge 34 A (GX Andromedae) 11.6 M1.5 V 00 18 +44 01 6.4 × 10 −3
26 Groombridge 34 B (GQ Andromedae) 11.6 M3.5 V 00 18 +44 01 4.1 × 10 −4
27 18 Epsilon Indi A 11.8 K5 V 22 03 −56 46 0.150
28 Epsilon Indi Ba 11.7 T1 Brown dwarf 22 04 −56 46
29 Epsilon Indi Bb 11.7 T6 Brown dwarf 22 04 −56 46
30 19 G 51-15 (DX Cancri) 11.8 M6.5 V 08 29 +26 46 1 × 10 −5
31 20 Tau Ceti 11.9 G8.5 V 01 44 −15 56 0.458
32 21 Luyten 372-58 12.0 M5 V 03 35 −44 30 7 × 10 −5
33 22 Luyten 725-32 (YZ Ceti) 12.1 M4.5 V 01 12 −16 59 1.8 × 10 −4
34 23 Luyten’s Star 12.4 M3.5 V 07 27 +05 13 1.4 × 10 −3
35 24 SCR J184-6357 A 12.6 M8.5 V 18 45 −63 57 1 × 10 −6
36 SCR J184-6357 B 12.7 T6 Brown dwarf 18 45 −63 57
37 25 Teegarden’s Star 12.5 M6 V 02 53 +16 52 1 × 10 −5
38 26 Kapteyn’s Star 12.8 M1 V 05 11 −45 01 3.8 × 10 −3
39 27 Lacaille 8760 (AX Microscopium) 12.9 K7 V 21 17 −38 52 0.029

Questions & Answers

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Communication is effective because it allows individuals to share ideas, thoughts, and information with others.
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Every time someone flushes a toilet in the apartment building, the person begins to jumb back automatically after hearing the flush, before the water temperature changes. Identify the types of learning, if it is classical conditioning identify the NS, UCS, CS and CR. If it is operant conditioning, identify the type of consequence positive reinforcement, negative reinforcement or punishment
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Skinner skipped the whole unconscious phenomenon and rather emphasized on classical conditioning
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Source:  OpenStax, Astronomy. OpenStax CNX. Apr 12, 2017 Download for free at http://cnx.org/content/col11992/1.13
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