Star forming gas can be ripped out of galaxies!
The European Southern Observatory's (ESO) Very Large Telescope (VLT) has observed the motion of gas being ripped out of galaxies. The majority of gas, that would have gone on to form new stars, is being ripped out causing the galaxy to turn from a blue galaxy filed with star forming gas, into a gas-poor red galaxy .
Just how many planets are there in our galaxy?
A study from Princeton has revealed that Gaia could potentially discover up to 70,000 planets in the galaxy over 10 years. This would lead to scientists getting a much better understanding of the number and variety of planets in our galaxy.
So far only 1,900 planets have been discovered. The more we discover the better we understand how likely it might be for life, to be elsewhere in the universe, even if it is only microbial.
Although Gaia is only set for a 5 year mission (reminds me of Star Trek), it could potentially be extended to 10 years, as does happen with many space craft, rovers, and satellites that continue to operate well past there intended mission life.
A new study published in the journal science show that the universe's background light indicate as many as half of its stars are hidden in the space between galaxies. You can see the results of the study: here
How would the stars get there?
Well an alternative proposal is that the light might in fact come from distant, very early galaxies. But if it is from starts in between galaxies, they would have ended up there after being stripped from their parent galaxy through gravitational forces.
It reminds me of the Star Trek Enterprise episode where they come across a rogue planet that has no star.
How could so many starts be outside of galaxies?
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