Alt er stille i børneværelset - eller?
Den mørke plet, som snor sig hen over dette flotte billede af stjerner i stjernebilledet Ophiuchus er ikke helt, hvad den måske ser ud til.
Det ser ud, som om der ikke er nogen stjerner i området, men det er der skam. De er blot skjulte bag pletten, som er en tæt støvsky med katalognavnet LDN 1768.
Selvom de ser ret kedelige ud, er skyer som LDN 1768 meget interessante for astronomerne. Det er nemlig her, de nye stjerner dannes. Inde i disse enorme barnekamre findes protostjerner - altså stjerner i de allertidligste faser af deres tilværelse. De er stadig i gang med at dannes af de gasarter og støvet, som er i skyerne.
Protostjerner er relativt kolde, og de er endnu ikke begyndt at udsende synligt lys. Istedet stråler de i submillimeterbølgelængder, som vi ikke kan se med øjet. Heldigvis bliver disse bølgelængder ikke absorberet af støvskyen, så med særlige teleskoper, som er følsomme i submillimeterområdet, kan vi se ind i støvskyerne og igennem dem, og dermed lære mere om protostjernerne og det, som ligger bagved. Atacama Large Millimeter/submillimeter Array (ALMA) er et observatorium, som blandt andet bruges til det formål.
Med tiden biver protostjernerne tætte og varme nok til at begynde den kernereaktion, som danner det synlige lys og så begynder de unge stjerner at lyse. Når det sker, bliver der ballade i børneværelset, for så sparker de nye stjerner dynen af sig; de blæser den omgivende støvsky væk, og gasserne omkring dem får de til at lyse op. Der dannes de fantastiske lysshow, som vi kalder et HII område.
ESO
Om billedet
| Id: | potw1612a |
| Sprog: | da |
| Type: | Observation |
| Udgivelsesdato: | 21. marts 2016 06:00 |
| Størrelse: | 8831 x 8418 px |
Om objektet
| Navn: | ldn 1768 |
| Type: | Milky Way : Nebula : Appearance : Dark |
| Constellation: | Ophiuchus |
Billedformater
Baggrundsbilleder
Koordinater
| Position (RA): | 17 20 13.24 |
| Position (Dec): | -26° 51' 12.12" |
| Field of view: | 35.03 x 33.39 arcminutes |
| Orientering: | Nord er 0.0° venstre fra lodret |
Farver & filtre
| Bånd | Teleskop |
|---|---|
| Optisk B | MPG/ESO 2.2-metre telescope WFI |
| Optisk B+V | MPG/ESO 2.2-metre telescope WFI |
| Optisk V | MPG/ESO 2.2-metre telescope WFI |
| Optisk I | MPG/ESO 2.2-metre telescope WFI |
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