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Galaxies
Galaxies are large systems of stars and interstellar matter, and they contain billions of stars. Our own galaxy, the Milky Way, has 200 to 400 billion stars, and there are over one billion known galaxies. Questions that have to do with galaxies in general and specific galaxies are perfect for this category!
2,392 Questions
Is there such thing as uriel the third planet of the malak in the spiral nebula messier 101?
Messier 101 or Pinwheel Galaxy is about 23.5 million light years from us. Way too far to see a star, let alone name one. Even less chance of detecting a planet.
So Uriel is science fiction.
Which galaxy is Canis Major located in?
None. The only two galactic object in the constellation are:-
* M41 is an open cluster
* NGC 2362 is an open cluster
What are some possible forms the dark matter in the halo of the Milky Way might be in?
We don't yet know enough about dark matter - or even if it really exists - to be able to speculate on what "form", if any, it might take.
You have to remember that "dark matter" is entirely theoretical, based on the supposed fact that the Milky Way doesn't have enough mass to keep it together, and that therefore there must be additional matter that we can't see - "dark" matter - to keep it all together. We've never detected any, nor do we know if we CAN detect any.
How are constellations and galaxies alike?
They really aren't very similar at all. A galaxy is an actual grouping of stars, from several millions up to hundreds of billions of them, held together by gravity.
A constellation is an arrangement of perhaps a few dozen stars in the night sky, that we perceive to form a familiar pattern; a horse, a crab, a lion, a dragon, a swan... But a constellation has no physical existence; it is only in the minds of the observers.
What part of the life cycle is the sun at now?
It is commonly understood that the sun, at 4.567 billion years is in it's mid-life, or about 1/2 way through it's life expectancy.
How many miles is the galaxy ic 1101?
It's around 55 times wider than the milky way. Roughly 3,850,000,000,000,000,000 miles across.
What is one of the pointer stars?
- Alpha Ursae Majoris (Dubhe) and Beta Ursae Majoris (Merak), which point to Polaris. (Northern Hemisphere)
- Alpha Centauri and Beta Centauri, which point to the Southern Cross. (Southern Hemisphere)
Does the big dippers stars move?
Yes they do. But they're so far away that you can't see the effects of their motion over the duration of a human lifetime.
Does milkey way have day and night?
No - the Milky Way Galaxy (and galaxies in general) are collections of gas, dust, planets & stars, all of which are gravitationally bound, spinning around a central core.
What is the evidence for dark energy?
The most direct evidence comes from supernovae observations in remote galaxies. Astronomers can use supernovas as 'standard candles' because the light we receive from them always follows the same pattern with time, allowing us to deduce how bright the supernova really is and by comparing it to how bright it appears on the sky, work out how far away it is.
Light from distant galaxies is also red shifted by the expansion of the universe and the red shift tell us how far way (back in time) the galaxy is and the rate of the expansion of the universe.
When astronomers calculate the expected amount of red shift for the supernovae based on how far away we know they are, they appear to be too strongly red shifted to account for the calculated expansion rate of the Universe. This means that the expansion of the universe is accelerating (which requires an energy to drive it). This energy is "dark energy".
There is also other, indirect, evidence for dark energy.
Is the color of a star determined by its location in the galaxy?
No. The color is determined by the star's temperature, not location.
A typical prominence rises thousands of kilometers; the largest observed by the "Solar and Heliospheric Observatory" (SOHO) was some 350,000 km (216,000 miles) long.
How many stars does the Draco constellation have?
the constellation Draco has 17 stars
some people say it is 14.
How is star formation related to spiral arms?
As interstellar clouds approach the spiral arm region it helps them to begin the collapsing process and eventually form a star.
When was the last super nova seen in the milkey way galaxy and who saw it?
SN 2006gy was an extremely energetic supernova that was discovered on September 18, 2006. Although about one hundred times as luminous as SN 1987A, which was bright enough to be seen by the naked eye, SN 2006gy was more than 1,400 times as far away as SN 1987A, and too far away to be seen without a telescope.
SN1987A was a supernova in the outskirts of the Tarantula Nebula. It could be seen with the naked eye from the Southern Hemisphere.
It was the closest observed supernova since SN 1604 The light from the supernova reached Earth on February 23, 1987.
SN1604 was seen on October 9th, 1604 generally a supernova occurs once every fifty years but the universe has been in a drought for these supernatural awesome events
SN1987A was a supernova in the outskirts of the Tarantula Nebula. It could be seen with the naked eye from the Southern Hemisphere.
