Quietgirl82

Quietgirl82, 3 days ago to random

Good morning everyone. :-)

It’s Friday, and the weekend will be upon us in a few hours.

Your girl had a pretty busy week, but she is looking forward to the weekend and immersing herself in lots of books.

Don’t forget to do something nice for yourself, check up on the people you haven’t talked to in a while, and remember it’s OK to ask for help.

Today we are gonna be talking about the cosmic distance ladder.

Think about a cosmic distance ladder like this: you’re in a vast, foggy city where you need to figure out how far away various landmarks are. But the fog is so thick, you can't see the landmarks directly from a distance. Instead, you have to use a series of increasingly sophisticated methods to work out these distances, starting from the closest to the furthest landmarks.

Step 1: Rulers and Tape Measures
First, you use a ruler for things right in front of you. This is like astronomers using actual measurements within our solar system, such as radar to bounce signals off planets and measure how long it takes for the signals to return. This gives a very accurate distance to planets within our solar system.

Step 2: City Layout Understanding For landmarks beyond the reach of a ruler, use the city's layout. By knowing distances between known landmarks, you can estimate other distances, similar to the astronomical "parallax" method. Astronomers measure the angle shift of nearby stars from two points in Earth’s orbit to determine their distance.

Step 3: Standard Lights When landmarks are too distant for city layouts to help, use known standard lights at measured landmarks. The light's brightness fades with distance in a predictable way, allowing distance estimation. This mirrors how astronomers use “standard candles” like Cepheid variables, whose known luminosity based on pulsation periods helps calculate their distance by observing their apparent brightness.

Step 4: Loudness of Sounds At the furthest landmarks, where standard lights are insufficient, the consistent noise they produce, such as a foghorn, helps estimate distance. The loudness drop is predictable, similar to using redshift and Type Ia supernovae properties in distant galaxies to measure vast distances.

Each step depends on the accuracy of the previous one, forming a "ladder" of methods or clues to progressively measure greater distances in the universe.

Quietgirl82, 3 days ago to random

Leave a little sparkle wherever you go. Be your complete, authentic, true self. Not everyone is going to like you; that's ok.✨✨✨✨

Quietgirl82, 5 days ago to random

Good morning everyone :-)

it’s Wednesday, the midpoint of the week. And the weekend will be upon us in a few more days.

It’s important to be kind to one another and remember, self love and respect is key to everything. Make sure you’re taking care of yourself and being the best you can be.

Today we are gonna be talking about Astrometry.

Astrometry is the study of precise measurements of the positions and motions of stars and other astronomical objects. Astrometry can be used to measure a star's parallax, thereby obtaining its distance. It is also employed to understand stellar dynamics. Accurate astrometric measurements can detect wobbles in a star's position, indicating the presence of a companion or an orbiting object. This can lead to the discovery of dormant black holes in binary systems or orbiting exoplanets in planetary systems. Astrometric measurements of stars can also provide information about the origin and evolution of a galaxy. The principle of astrometry is widely utilized by the European Space Agency's Gaia mission.

Quietgirl82, 5 days ago to random

No matter how tough it gets this week, keep going. Care more about just being yourself than what others may think of you.✨✨✨✨

SerenaTori, 6 days ago to random

Damn I feel so horrible. Even if this is not Covid, it’s really doing me in. Starting to run a fever now. Yay!

UnicornQueen1, 6 days ago to random

hi everyone. It’s me just testing on my new phone. Anyway, I hope y’all have had a great day today.

Quietgirl82, 6 days ago to random

No other love will warm your heart as completely as self-love. Work on the things that make you feel "less than": your insecurities, your fears, your dark thoughts. Once you make peace with yourself, you'll conquer the world. You never know what profound impact you might have on someone's life. Try to make it a good one.✨✨✨✨