Recent content by Gilad Barnea

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    Undergrad What Is Earth's Escape Velocity and Why Don't Rockets Reach It Immediately?

    Thanks! Got it.
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    Undergrad What Is Earth's Escape Velocity and Why Don't Rockets Reach It Immediately?

    Hi, First FYI, I have no education in physics. Anyway - I know Earth's escape velocity is about 41,000 kph. Anything less, and you'll eventually fall down back to earth. Two points that seem to contradict each other - 1. Escape velocity gets decreased the farther away you are from the...
    • Gilad Barnea
    • Thread
    • Escape Escape velocity Perspective Velocity
    • Replies: 4
    • Forum: Mechanics
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    Undergrad How Do We Determine the Original Color of Light from Distant Galaxies?

    Hey Jamie, Thanks for the subtle but significant correction. I think I'm starting to really like that forum!
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    Undergrad How Do We Determine the Original Color of Light from Distant Galaxies?

    Awesome! Thanks!
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    Undergrad How Do We Determine the Original Color of Light from Distant Galaxies?

    Hey everyone, I get it - the faster the object is moving away from me, the more the light it emits moves to the red side of the spectrum. But here's my question: Here on earth, we watch galaxy A, which seems to have a very red light. How can we know it's not "originally" that red, and if it...