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Understanding her discovery
Let us understand this- Suppose stars are light bulbs ok? 100 watt bulb=bright star.
Now, you see a 100 watt bulb in the sky, but you notice that it pulsing very fast i.e., it is going from bight to dim to bright to dim very fast. But according to Henriatta, a 100 watt bulb would pulse slow (a bright star pulses slow). which means that this is a 30 watt bulb close to the earth, and you see it bright because it is close to you . BINGO!
Ex 2- you see a dim star pulsing slowly, which is false cuz Dim pulses fast. Hence, this star is actually very bright but it is far away from you.
(Got it?)
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MORE IDEAS ON THIS
Henriatta Leavitt
During the 20th century, scientists would just look at the night sky and imagine How do we know how far a star is and what is its brightness? Because a star which would be very bright wold seem to be very dim if it was very distant from you. Stars pulse too i.e., they blink from ...
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The doors she opened
Hubble measured the distance to a star which was so far, that the science community declared it to be of somewhere out of the Milky Way Galaxy; the andromeda galaxy.Henriatta indirectly hepled discovering a new galxy, and the expansion of the universe. Hubble noticed that the gal...
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Beginning and dark energy
The dots on the balloon move apart, when you blow air in it. What causes the universe to do so or to expand?.
It turns out to be dark energy. Scientists know 1 thing about dark energy that they don't know it. Dark energy is 1 of the biggest mysteries, no o...
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Speed of the expansion
Imagine you throw a ball up in the sky, but instead of coming down, it slows for 1 sec and then shoots off in space like a rocket. What will be your reaction?
Scientists had the same reaction when they discovered that the expansion of the universe is speeding up very fast.
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The end of the universe
If universe has a beginning, it must have an end, right? I mean look at you, you born and you will die. There are 2 ways:
- The heat death- It states that everything will go sooooooooooooooooooo distant that the entropy would be zero and nothing will interact. And all wi...
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CURATED FROM
IDEAS CURATED BY
Dark matter, theory of relativity, dark energy, negative mass, end of the universe, The Big Bang, 'What is beyond the universe?' etc. If you love such things, Welcome to your home.'
Related collections
Other curated ideas on this topic:
The standard candle method
If we know the intrinsic brightness of an object in space - that is, how bright an object really is - then we can estimate its distance from how bright it appears to us from Earth.
- One type of standard candle is a 'Cepheid variable'. Cepheid variables are a...
What's The Block Hole
A black hole is a place in space where gravity pulls so much that even light can not get out. The gravity is so strong because matter has been squeezed into a tiny space. This can happen when a star is dying.
Because no light can get out, people can't see black holes. They...
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