Statements (24)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
astronomical spectral line
|
| gptkbp:alsoKnownAs |
hydrogen line
|
| gptkbp:animationType |
spin-flip transition
|
| gptkbp:causedBy |
hyperfine transition
|
| gptkbp:discoveredBy |
gptkb:Harold_Ewen
|
| gptkbp:discoveredIn |
1951
|
| gptkbp:emits |
neutral hydrogen clouds
|
| gptkbp:energyDifference |
5.87433 μeV
|
| gptkbp:frequency |
1420.40575177 MHz
|
| https://www.w3.org/2000/01/rdf-schema#label |
21 cm line
|
| gptkbp:importantFor |
gptkb:cosmology
galactic astronomy |
| gptkbp:notVisibleTo |
optical telescopes
|
| gptkbp:observedBy |
radio telescopes
|
| gptkbp:originatedIn |
neutral hydrogen atom
|
| gptkbp:symbol |
gptkb:HI_line
|
| gptkbp:usedFor |
mapping galactic structure
measuring redshift studying interstellar medium |
| gptkbp:usedIn |
radio astronomy
|
| gptkbp:wavelengthRange |
21 centimeters
|
| gptkbp:bfsParent |
gptkb:hydrogen_atom
gptkb:H^0 |
| gptkbp:bfsLayer |
5
|