Get an answer in 5 minutes

We'll notify as soon as your question has been answered.

Plus iconAsk a question to our educators
PHYSICS
Asked by Debbie

How big is our galaxy?

The Milky Way's disk spans at least 100,000 light-years and probably contains several hundred billion stars, which makes our home galaxy a giant. However, the Milky Way is surrounded by a "halo" of cold dark matter, which produces no detectable energy but that reveals its presence by exerting a gravitational pull on the visible matter around it. The dark matter probably consists of some type of subatomic particle created in the Big Bang. This halo probably spans 250,000 light-years, and perhaps a great deal more.

Ryan's profile picture
Verified
Ryan Lai
·

6.2k students helped

The average radius of our galaxy, The Milky Way, is about 50,000 light years. To put that in perspective, if a commercial airliner, let’s say a Boeing 747 flew at a speed of 600mph then it would take approximately 50 billion years to fly from the centre to the edge. So to get from one end to the other, it would take 100 billion years in the plane. Our universe is only 14 billion years young...

Raafay's profile picture
Verified
Raafay Karim
·

114 students helped

Similar Physics questions

Need help with Physics?

Getting expert help from a tutor is a great way to improve your Physics grades.

Badge showing the text 'New'Learn Physics with Video Lessons

What is Electricity? A GCSE refresher course
11m · 3 videos
Jennifer's profile picture
Jennifer Taylor
·

837 students helped

What is Electricity? A GCSE refresher course
What is Momentum?
21m · 5 videos
Jennifer's profile picture
Jennifer Taylor
·

837 students helped

What is Momentum?
Energy 101: The Basics
15m · 3 videos
Jennifer's profile picture
Jennifer Taylor
·

837 students helped

Energy 101: The Basics
Atomic Theory and Radioactivity
31m · 5 videos
Jennifer's profile picture
Jennifer Taylor
·

837 students helped

Atomic Theory and Radioactivity

Premium video lessons available now on Scoodle

50% discount available

Scoodle's video lessons make learning easy and fun. Try it for yourself, the first lesson is free!