Sign up now
to enroll in courses, follow best educators, interact with the community and track your progress.
100 lessons,
4h 52m
Enroll
14k
Download
How massive is the Milky Way?
8,860 plays

More
In this video get to know how massive the Milky way is and how different scientists have been working on figuring out the exact mass of it.

Unacademy Bytes
Daily Trivia

U
Unacademy user
sir Kyu nahi Hui AB and CD Mai agar force pucha hota by magnetic field toh AD and BC Mai hota na
mam i need video on hubble's law. and calculative part of... astronomy. calculation of velocities distances and speed of planets or celestial bodies..!!
SM
ma'am plz make vdo on waste management (all kind of,,,electronic, etc) & how we can use r all kind of energy in r day-to-day life
Ma'am please make a video on 'how to remove an "IAS" officer? "
Please make video on how sun will destroy
Very informative lesson!
  1. How massive is the Milky way?


  2. Many scientists have been working on figuring out the exact mass but as per the current measurement the Milky Way weighs in at around 700,000,000,000 solar masses, or in other words, the mass of our sun multiplied by 700 billion.


  3. So how do we go about measuring a galaxy which is so so enormous?


  4. First of all, galaxies not only include stars, planets, moons, gases, dust, and other objects and material, they also contain a good chunk of dark matter.


  5. mc R OMI mim The method is based on the equations of gravity derived by Isaac Newton more than 300 years ago, which tell you that the speed and distance at which a smaller body rotates around a larger one is related to the mass of the larger object.


  6. To measure the Milky Way's mass, Eadie is using the velocities of globular star clusters which are basically spherical collection of stars that orbit our galaxy.


  7. To determine the total velocity of a ciuster, it has to be measured in two directions: . . one along our line-of-sight (a straight unobstructed view), and the other across the plane of the sky (perpendicular to the line of sight)