When (Neutron) Stars Collide : This Illustration Shows The Hot, Dense, Expanding Cloud Of Debris Stripped

Slytherin: guys, if we don’t make it out alive, I just want to say that…

All other houses of Hogwarts:-shining eyes- what? What is it?

Slytherin: Since I’m almost perfect, I’m blaming this on you all

i hope this meme isn’t dead yet lmao

Edwin Jarvis: Peggy no!

Peggy: Peggy yes!

Almost every guy ever: PEGGY NO

Peggy: Screw you! PeGGY YES!!

Steve Rogers: Peggy Yes!!!!!

Peggy: PEG-

Peggy: oh.

Peggy: Ooh I like him

Types stereotype at school/college (sarcastic)

MBTI in college (stereotypical/sarcastic)

I’ll do college. This turned out to be more stereotypical than sarcastic :/

INFJ - Sits around the campus to people-watch for hours, makes friends with the campus cat, realizes they are actually the campus cat, actually makes an effort to cook

INTJ - Is graduating a year early because they take twice the normal course load even during the summer, somehow still has time to read books that are not required textbooks

INTP - Lives in the computer lab, always wears the same clothes (because they’re too lazy to go home to shower), forgets to go to classes and exams, miraculously stays up for 72 hrs straight before essay due dates

INFP - Goes on a quest to find themselves, changes majors 5 times, enters an existential crisis and broods about life for months, stops caring about the outside world and walks into every single pole and door on campus

ISFJ - Wanders around the campus with neatly organized binders, color-codes post-its, and colorful gel pens, could open a stationary store but they’re way too attached to their pens

ISFP - Sneaks into the science lab to rescue all the lab animals, opens an animal rights club, finds their true calling by becoming a social activist, runs a rally every week on campus

ISTP - Goes to classes but always sits at the back and sleeps, tries to make their own beer as an experiment, joins a band, forgets they were in school

ISTJ - Has tons of “friends” who constantly ask to borrow their very organized lecture notes, low key enjoys the popularity

ENTP - Makes money off ISTJ’s notes by photocopying and selling them to other students, becomes a full time entrepreneur, drops out

ENFP - Keeps failing exams because they get bored and doodle all over the essay questions, switches majors 20 times, is undeclared until 4th year

ENTJ - Gets an internship during 2nd year, job offers during the 3rd year, is reluctant to come back to school but unfortunately they do need those grades for law school

ENFJ - Volunteers at charities around the city, can be seen at student networking events, joins a bunch of student clubs and ends up running all of them

ESFP - Is constantly hungover or constantly high, crashes parties as a hobby, can never be found inside their dorm room

ESTP - Breaks into school at night to drink because just taking classes is not challenging enough, streaks around the campus when final exams are done

ESTJ - An honor student with straight A’s, reads all textbooks since the first month, argues with professors for getting some facts wrong, ends up being a Teaching Assistant

ESFJ - Is in college for the sole purpose of making friends and hanging out with them, succeeds, has at least 10 friends in every class, holds house parties with 100+ people, everyone mistakes their house for a sorority/frat

-eilamona[ MBTI Merch | Support eilamona on patreon ]

[ send sarcastic asks | previous sarcastic answers ]

Why did the integer drown?

It couldn’t float.

Actual advice on how to study for engineering courses from a first year student

Okay so I just finished my first semester in university and lets just say I’ve got to change my whole learning/studying style to be able to survive here. Here are some of the things I’ve learnt to do and will be doing in second semester:

1. Start backwards:

 I highschool, you try to learn the subject by going to class, listening to the teacher, then going home, reading the textbook, then doing the homework, then making notes, then studying for the final. In engineering, you have to do this backwards: You will realize that you are going to be basically teaching yourself the content one way or another soon before the finals, so better start now. First, go through the past exams and past papers - make a list of all the major topics covered (example: if in an electrical circuits course, a question on a past final exam is “find the equivalent circuit using thevenin’s theorem” then write Thevenin’s theorem as a topic to be learned). Then go on youtube and find videos that explain each of these topics to you and make rough notes on these topics. (Reblog if you want me to make a master list of all the youtubers that teach engineering really well). Then go through he textbook and find sample questions not he theorem/topic you learnt off of youtube, and solve them. Then write your doubts in a notebook. Then go to class and have two notebooks open : one where you are taking notes of what the prof is saying, and one which has your practice problems solved, and see if the prof clarifies your doubts in the lecture. The lecture should be review of what you learnt at home!!!! Then, after class go to the prof and clarify any doubts. Then go home and make final notes on the topic. I like to make notes on cue cards (more on this later). Then go back to the final exam and see if you can solve the problem.

2. Make cue cards:

I like to get index cards and write a short note on how to solve each type of question I am likely to see on a final exam on each question card. Example: one cue card for “how to find resistance using wheatstone bridge” . I link the cue cards with a clip and its easier to carry the around and study.

3. Get pretty notebooks and organize your stationary. Its easier to stay focused when everything is pretty. 

Slytherin’s as parents

family is everything

think their kids the best no matter what

come off as strict but they just worry

“Because I said so.”

“No but’s.”

will kill anyone who says something against their child

always reads bedtime stories

holds their kid’s hand when crossing the road (up to an age where it becomes embarrassing for the kid)

“I love you no matter what they say”

are very serious about their kid’s education

tell their kids horror stories about themselves to prevent them from doing stupid things

always suspicious about their kid’s friends

dress to impress

“I want to talk to the teacher.”

have strict rules around the house

“When you move out you can do whatever you want to”

sometimes team up against their kids

come off as cold but their have so much love to give

they have that voice that sends chills down your spine when they’re being mad

discipline is what they believe in

8 Common Questions About Our James Webb Space Telescope

You might have heard the basics about our James Webb Space Telescope, or Webb, and still have lots more questions!  Here are more advanced questions we are frequently asked.  (If you want to know the basics, read this Tumblr first!)

Webb is our upcoming infrared space observatory, which will launch in 2021. It will spy the first luminous objects that formed in the universe and shed light on how galaxies evolve, how stars and planetary systems are born and how life could form on other planets.

1. Why is the mirror segmented? 

The James Webb Space Telescope has a 6.5-meter (21.3-foot) diameter mirror, made from 18 individual segments. Webb needs to have an unfolding mirror because the mirror is so large that it otherwise cannot fit in the launch shroud of currently available rockets.

The mirror has to be large in order to see the faint light from the first star-forming regions and to see very small details at infrared wavelengths. 

Designing, building and operating a mirror that unfolds is one of the major technological developments of Webb. Unfolding mirrors will be necessary for future missions requiring even larger mirrors, and will find application in other scientific, civil and military space missions.

2. Why are the mirrors hexagonal?

In short, the hexagonal shape allows a segmented mirror to be constructed with very small gaps, so the segments combine to form a roughly circular shape and need only three variations in size. If we had circular segments, there would be gaps between them.

Finally, we want a roughly circular overall mirror shape because that focuses the light into the most symmetric and compact region on the detectors. 

An oval mirror, for example, would give images that are elongated in one direction. A square mirror would send a lot of the light out of the central region.

3. Is there a danger from micrometeoroids?

A micrometeoroid is a particle smaller than a grain of sand. Most never reach Earth’s surface because they are vaporized by the intense heat generated by the friction of passing through the atmosphere. In space, no blanket of atmosphere protects a spacecraft or a spacewalker.

Webb will be a million miles away from the Earth orbiting what we call the second Lagrange point (L2). Unlike in low Earth orbit, there is not much space debris out there that could damage the exposed mirror. 

But we do expect Webb to get impacted by these very tiny micrometeoroids for the duration of the mission, and Webb is designed to accommodate for them.

All of Webb’s systems are designed to survive micrometeoroid impacts.

4. Why does the sunshield have five layers?

Webb has a giant, tennis-court sized sunshield, made of five, very thin layers of an insulating film called Kapton.  

Why five? One big, thick sunshield would conduct the heat from the bottom to the top more than would a shield with five layers separated by vacuum. With five layers to the sunshield, each successive one is cooler than the one below. 

The heat radiates out from between the layers, and the vacuum between the layers is a very good insulator. From studies done early in the mission development five layers were found to provide sufficient cooling. More layers would provide additional cooling, but would also mean more mass and complexity. We settled on five because it gives us enough cooling with some “margin” or a safety factor, and six or more wouldn’t return any additional benefits.

Fun fact: You could nearly boil water on the hot side of the sunshield, and it is frigid enough on the cold side to freeze nitrogen!

5. What kind of telescope is Webb?

Webb is a reflecting telescope that uses three curved mirrors. Technically, it’s called a three-mirror anastigmat.

6. What happens after launch? How long until there will be data?

We’ll give a short overview here, but check out our full FAQ for a more in-depth look.

In the first hour: About 30 minutes after liftoff, Webb will separate from the Ariane 5 launch vehicle. Shortly after this, we will talk with Webb from the ground to make sure everything is okay after its trip to space.

In the first day: About 10.5 hours after launch, Webb will pass the Moon’s orbit, nearly a quarter of the way to Lagrange Point 2 (L2).

In the first week: We begin the major deployment of Webb. This includes unfolding the sunshield and tensioning the individual membranes, deploying the secondary mirror, and deploying the primary mirror.

In the first month: As the telescope cools in the shade of the sunshield, we turn on the warm electronics and initialize the flight software. As the telescope cools to near its operating temperature, parts of it are warmed with electronic heaters. This prevents condensation as residual water trapped within some of the materials making up the observatory escapes into space.

In the second month: We will turn on and operate Webb’s Fine Guidance Sensor, NIRCam, and NIRSpec instruments. 

The first NIRCam image, which will be an out-of-focus image of a crowded star field, will be used to identify each mirror segment with its image of a star in the camera. We will also focus the secondary mirror.

In the third month: We will align the primary mirror segments so that they can work together as a single optical surface. We will also turn on and operate Webb’s mid-infrared instrument (MIRI), a camera and spectrograph that views a wide spectrum of infrared light. By the end of the third month, we will be able to take the first science-quality images. Also by this time, Webb will complete its journey to its L2 orbit position.

In the fourth through the sixth month: We will complete the optimization of the telescope. We will test and calibrate all of the science instruments.

After six months: Webb will begin its science mission and start to conduct routine science operations.

7. Why not assemble it in orbit?

Various scenarios were studied, and assembling in orbit was determined to be unfeasible.

We examined the possibility of in-orbit assembly for Webb. The International Space Station does not have the capability to assemble precision optical structures. Additionally, space debris that resides around the space station could have damaged or contaminated Webb’s optics. Webb’s deployment happens far above low Earth orbit and the debris that is found there.

Finally, if the space station were used as a stopping point for the observatory, we would have needed a second rocket to launch it to its final destination at L2. The observatory would have to be designed with much more mass to withstand this “second launch,” leaving less mass for the mirrors and science instruments.

8. Who is James Webb?

This telescope is named after James E. Webb (1906–1992), our second administrator. Webb is best known for leading Apollo, a series of lunar exploration programs that landed the first humans on the Moon. 

However, he also initiated a vigorous space science program that was responsible for more than 75 launches during his tenure, including America’s first interplanetary explorers.

Looking for some more in-depth FAQs? You can find them HERE.

Learn more about the James Webb Space Telescope HERE, or follow the mission on Facebook, Twitter and Instagram.

Make sure to follow us on Tumblr for your regular dose of space: http://nasa.tumblr.com.