object | picture | age | size | otherinfo | distance |
---|---|---|---|---|---|
initial collapse of a molecular cloud (phase 2 of stellar birth) | |||||
B335 | 105 years | cloud size = 6000 au | core mass = 0.4 mass(sun) | ||
EGGs... are these a special case? | |||||
Evaporating Gaseous Globules | Eagle nebula is 2 x 106 yrs old | each EGG is 50-100 au | uv starlight from upper right is evaporating the birth trappings of the central protostar | 7000 c-yr | |
in the Eagle Nebula | |||||
EGGs will live only 10,000 more years | |||||
the Herbig-Haro objects: jets and disks (phase 3 of the starbirth process) | |||||
HH30 jet&disk | age of the jet = 20,000 yr | disk = 500 au | jet velocity = 300 km/s | 450 c-yr | |
jet = 1600 au | |||||
HH34 jet | jet = 5000 au | jet velocity = 200 km/s | 1500 c-yr | ||
HH47 jet | jet = 30,000 au = .5 c-yr | 1500 c-yr | |||
HH1-2 jet | jet = 1 c-yr | 1500 c-yr | |||
the Orion proplyds: disks without jets (phase 4 of stellar birth) | |||||
Orion edge-on proplyd (star hidden by dust) | 105-106 yr | disk = 1400 au | 1500 c-yr | ||
Orion face-on proplyd with star visible in center | 106 years | disk = 600 au | mass(protostar)/mass(sun) = 1.2 | 1500 c-yr | |
Orion mosaic | 105-106 yrs | disk diameters = 100 - 1400 au | mass(protostars)/mass(sun) = 0.3 - 1.5
mass(disks)/mass(earth) = 0.1 - 700 |
1500 c-yr | |
containing 153 proplyds like these | disk diameters = 150 - 650 au | ||||
planet building: protostars or young main sequence stars with disks which may contain protoplanetary objects (early phase 5 of stellar birth) | |||||
Warped disk around Beta Pictoris | 100 million yrs | disk diameter = 1000 au | pink-white inner disk is tilted slightly to red-yellow-green outer disk | 50 c-yr | |
may indicate presence of a planet | disk thickness = 10 au | warping planet sweeps out 25 au clear zone around star | |||
planet mass = 0.05 - 20 mass(jupiter) | |||||
medium-old main sequence stars with disks
containing
planetary- or comet-like objects |
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comets in the inner Kuiper belt | 4.5 billion years | diameter = 60 - 200 miles | about 500 discovered so far | 50 - 500 au? | |
there may be 200 million of these in the inner Kuiper belt | |||||
Pluto, its companion Charon, and other dwarf planets |
4.5 billion years | Pluto's diameter = 2300 km | Pluto is probably the largest and nearest of the comet-like objects in the Kuiper belt | 40 au from the sun or more |
|
Charon's diameter = 1300 km | |||||
planets around other sun-like stars |
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and now 200 extra-solar planets (around stars like the sun)! |
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