What kind of object do we think lies in the center of the Milky Way galaxy?
At the very centre of the Galaxy lies a remarkable object—a massive black hole surrounded by an accretion disk of high-temperature gas. Neither the central object nor any of the material immediately around it can be observed at optical wavelengths because of the thick screen of intervening dust in the Milky Way.
What do we see when we look at the Milky Way?
All the stars we see in the night sky are in our own Milky Way Galaxy. Our galaxy is called the Milky Way because it appears as a milky band of light in the sky when you see it in a really dark area. Just as the Earth goes around the Sun, the Sun goes around the center of the Milky Way.
How long does it take our solar system to complete one orbit around the Milky Way galaxy?
about 225-250 million years
How long does it take our solar system to complete one orbit around the Milky Way galaxy quizlet?
230 million years
Where is our solar system located within the Milky Way galaxy group of answer choices?
Our solar system is located in the center of the Milky Way Galaxy. In the grapefruit model of the solar system, it would take a few minutes to walk from the Sun to the inner edge of the Kuiper Belt (Pluto). The observable universe is the same size today as it was a few billion years ago.
Can galaxies form without dark matter?
“The thing is, we have no idea how star formation would proceed in the absence of dark matter,” van Dokkum says. “All we can say is that there must have been very dense gas early on in their history,” otherwise, galaxies without dark matter couldn’t create new stars.
How long would it take to count all the stars in the Milky Way galaxy?
100 billion seconds
Can you see stars outside the Milky Way?
The answer is no – unless you count seeing the combined light of many billions of stars. From the Northern Hemisphere, the only galaxy outside our Milky Way that’s easily visible to the eye is the great galaxy in the constellation Andromeda, also known as M31. This is the edgewise view into our own Milky Way galaxy.
What are 3 characteristics of a irregular galaxy?
They have no defined shape nor structure and may have formed from collisions, close encounters with other galaxies or violent internal activity. They contain both old and young stars, significant amounts of gas and usually exhibit bright knots of star formation.
How old is an irregular galaxy?
The very bright stars in the picture, those with spikes around them, are stars in the foreground belonging to the Milky Way. The main body of SagDig is rich in gas, and contains many regions of active star formation. Indeed, the average age of the stars in the galaxy is a relatively young 4 to 8 billion years.
What is the likely cause of irregular galaxies?
The irregular shape may be the result of a disturbance, perhaps a collision of two galaxies. The Small Magellanic Cloud (SMC) is near the constellation Tucana, and is under 200,000 light-years away. The Cartwheel Galaxy has a ring-like structure that is the result of a head-on collision of two galaxies!