What are the largest individual galaxies in the universe?
The largest individual galaxies in the universe are known as central dominant galaxies.
Why do astronomers hypothesize that a massive black hole lies at the center of M87?
Why do astronomers hypothesize that a massive black hole lies at the center of M87? A very small region at the center of M87 releases an enormous amount of energy. Gravitational potential energy is converted to thermal energy as matter from the surrounding gas disk spirals into the central black hole.
Which of the following galaxies has the highest rate of star formation?
A starburst galaxy is a galaxy undergoing an exceptionally high rate of star formation, as compared to the long-term average rate of star formation in the galaxy or the star formation rate observed in most other galaxies.
What is the distinguishing feature of a starburst galaxy?
In fact, it is a starburst galaxy. The infrared radiation is coming from dust heated by the continuing star formation and is another distinguishing characteristic of a starburst galaxy, in addition to the strong narrow optical emission lines that you encountered earlier.
What is the largest body in the universe?
Hercules-Corona Borealis Great Wall
The largest known ‘object’ in the Universe is the Hercules-Corona Borealis Great Wall. This is a ‘galactic filament’, a vast cluster of galaxies bound together by gravity, and it’s estimated to be about 10 billion light-years across!
Which of these galaxies is most likely to be oldest?
12 Cards in this Set
|Which of these galaxies is most likely to be oldest?||A galaxy observed at a distance of 5 billion light-years|
|If earths orbital radius doubled in size,||the parallax shifts of nearby stars would double in size|
What is the primary source of a quasar’s energy?
The primary source of a quasar’s energy is. Gravitational potential energy. From where is the energy of a quasar emitted?
Which galaxies are the smallest?
Scientists at the University of California at Irvine have discovered a galaxy so small that it barely even qualifies as a galaxy. Deemed “Segue 2,” the dwarf galaxy only contains about 1,000 stars and is the least massive galaxy in the known universe, reports Phys.org.
Why do starburst galaxies form stars so quickly?
Starburst galaxies have unusually high rates of star formation, and those bursts last for a short time during the galaxy’s long life. That’s because star formation burns through the gas reserves of the galaxy very quickly.
Which type of galaxy is the youngest?
However, observations only recently reclassified it as a barred type spiral galaxy. One of the youngest galaxies ever discovered was the I Zwicky 18 galaxy. It was estimated to be around just 500 million years old though recent observations have discovered old stars in this galaxy.