What Is The Purpose Of Water During A Rocket Launch?

If you’ve ever watched STS launch (Space Transportation System launch), you would’ve noticed plenty of water flowing right under the rocket. If you have no clue what I’m talking about, watch this STS launch video:

And here’s a screenshot, just in case the video goes down –

This is a sound suppression water system and you can read more about it on NASA’s official website here.

This basically helps to protect the rocket and the platform from all the energy that’s released during the take off.

Here’s a quote from this article:

The water system is designed to protect the Shuttle and its payloads from any damage that may occur from acoustical energy reflected from the Mobile Launcher Platform (MLP) during launch. The water is released seconds before ignition of the orbiter’s three main engines and twin Solid Rocket Boosters (SRB), then flows through parallel 7-foot-diameter pipes to the Pad.

The system includes a 290-foot-high water tank filled with 300,000 gallons of water, and it empties in 41 seconds during a launch. Water pours from 16 nozzles on top of the flame deflectors and from outlets in the Shuttle main engine exhaust hole in the MLP at main engine ignition, which occurs approximately 7 seconds before liftoff.

The system was first installed at the pad when reflective energy from the top of the Mobile Launch Platform was causing minor damage to thermal curtains on the SRBs and putting stress on the wings. After adding the system, the sound pressure was reduced by half.

Why is Space Black?

We all know that Space is huge. It’s so huge that you can even say it’s infinite. Which means if you look in any direction, you’re basically looking at a star!

So the light coming the stars should illuminate the night sky and it shouldn’t be dark or black in color. So why is Space black?

This is exactly what Heinrich Wilhelm Olbers (a german astronomer whose name I can’t pronounce correctly) asked in 1823. We call this the Olbers paradox!

The paradox goes like this: if the Universe is infinite, static and has existed forever, then everywhere you look should eventually hit a star.

But we know this is not the case!

So by proposing this paradox, Olbers knew the Universe couldn’t be infinite, static and timeless. It could be some of these, but not all three.

In the 1920s, Edwin Hubble discovered that the Universe isn’t static. In fact, galaxies are speeding away from us in all directions.

This led to the theory of the Big Bang, that the Universe was once gathered into a single point in time and space, and then, expanded rapidly. Our Universe has proven to not be static or timeless. And so, the paradox was SOLVED!

Well, not exactly! There are stars all around so we should still be seeing a bright sky at night. But we don’t.

This is because, as the Universe expanded, the wavelengths of that initial visible light were stretched out and out and dragged to the wide end of the electromagnetic spectrum until they became microwaves.

This is Cosmic Microwave Background Radiation. And yes we can detect that in every direction we look in.

So Olbers was right. If you look in every direction, you’re seeing a spot as bright as a star, it’s just that the expansion of the Universe stretched out the wavelengths so that the light is invisible to our eyes.

And that’s exactly why we see a black or a dark sky at night 🙂

Zoom In And Out Of Websites Quickly In Google Chrome

This post is a short tip on how to Zoom in and out of websites quickly in Google Chrome. This must work on almost every other browser like Internet explorer or Mozilla Firefox.

Lets say you brought a new high resolution big screen monitor. And now all these websites appear so tiny and the text is very difficult to read. But don’t worry, you can zoom in and out using the keyboard shortcuts.

These keyboard shortcuts will be very useful for day to day tasks and make your browsing experience easy.

  1. For zooming in the website just hit Control and + (plus) key on the keyboard.
  2. For zooming out, hit Control and – (minus) key on the keyboard.
  3. To reset zoom back to normal, just hit Control and 0 (zero) key on the keyboard.

Note that, you can also zoom in and out by holding the CTRL key and using the mouse scroll.

I hope this is helpful. Thanks for reading and do subscribe to blog feed for more amazing posts. You can find the subscription box below.

How To View Email Subscribers List In FeedBurner

Most of you use feedburner for sending out feeds to your subscribers. Some people have asked me if they can view the complete list of email subscribers in feedburner.

The answer is yes. You can view the entire list of email subscribers in feedburner. Also you can see how many of them are verified/active subscribers.

To check this list of email subscribers, just follow the steps given below –

  1. Log in to your Feedburner account
  2. Select the feed title from the list.
  3. Click on Publicize tab.
  4. From the services list, Click on Email Subscriptions.
  5. Now scroll the page and select View Subscriber Details.
  6. This will show up the full list of email subscribers for your feedburner account.

You can also export this list of email subscribers from feedburner account to any other rss feed service. Right after you click on ‘View Subscriber details’, you can see an option for Export: CSV.

Thanks for reading and do subscribe to blog feed for more amazing posts. You can find the subscription box below.

Fix Error Establishing a Database Connection in WordPress

Recently i was trying to install WordPress on my friend’s localhost but an error occurred which said – “Error establishing a database connection in WordPress“.

I’ll not go in detail, lets just solve the error right away. In order to fix – Error establishing a database connection, you’ll need to follow two steps.

  1. Creating a new Database
  2. Creating Database User
  3. Editing wp-config file of your WordPress package.

Where to Find wp-config file?

If you plan to install WordPress on Local Host using WAMP server then wp-config file has to be inside www folder (C:wampwww). If you plan to install WordPress on Web Host then you can access wp-config file using FTP Client like FileZilla.

You need to know the right location of wp-config file in order to proceed. If at all you have any difficulty to find wp-config, just leave a comment below and i’ll surely help you out.

Step 1 – Creating Database

Step 2 – Creating Database User

  • If you are installing WordPress on Local Host then just go to step 3
  • If you are installing WordPress on Web Host then read THIS article.

Step 3 – Editing wp-config file

When you open wp-config file, you’ll see something as shown below.

WP Local Host Installation

If you have created database named XYZ then make the following changes in your wp-config file –

WP Web Host Installation

If you have created database named ABC and created a user with username: admin and password: hello then just make the following changes in your wp-config file (which is on the server).

Long Story Short

You need to create database and database user. The database user will have username and password. This error usually occurs because of mismatch in configuration. So to fix it, open wp-config file and enter the right database name, database username and database user password. Save the file where it is supposed to be. And problem of “Error establishing a database connection in WordPress” will be solved.

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Custom Tag Buttons Widget For WordPress Using CSS

I’ll be sharing the code for custom tag buttons which you can use as a widget in your WordPress Blog. I have designed these buttons using CSS.

So in order to implement these, you’ll need to add two part of codes. One is CSS and other is HTML. You’ll need to put the CSS code at the bottom of style.css file of your WordPress theme. And you’ll have to add the HTML code inside a text widget.

Below is the screenshot of how the custom tag buttons look like. These are very simple buttons with round border. Also when you move your cursor over the button, the color of the button changes into a darker shade.

Custom Tags

CSS Code

You can use the CSS code as it is. But if you want to make any changes, feel free to experiment with it. If you are not sure about how to use it, then follow these steps –

  1. Open WordPress Administrators Dashboard
  2. Go to Appearance > Editor
  3. This should open the Stylesheet (style.css)
  4. Go to the bottom of this file and paste the CSS code given above.
  5. Save the file.

HTML Code

The HTML code which i use to display the buttons in the screenshot is given below. Note that, these buttons link to my blog categories.

You cannot use this code as it is. You’ll need to change it according to your need. For example, if you need a custom tag button to link to google.com then the format for that is given below –

In this way you can write a html code for a button with desired link. And then just copy the html code and use it inside a text widget. If you are unsure about how to use the code then follow these steps –

  1. Open WordPress Administrators Dashboard
  2. Go to Appearance > Widgets
  3. Drag the text widget into your desired Widget Area
  4. Paste the html code inside the content area of Widget. (leave the title empty)
  5. Save the widget.
  6. Go to your blog’s home page and you’ll find the custom tag button in the widget area of your choice.

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Adding Shadow To The Text In Photoshop Elements 10

In this post, I’ll show you guys about how to Add Shadow or Drop Shadow to the text in Photoshop Elements 10. This is very easy but there’s some difference as compared to other versions of Photoshop (like Creative Suite).

First of all create new blank file and write some text in the canvas. I’ll write something like ‘Hello’ inside the canvas in green color. Then i’ll just right click on this text and select ‘Edit Layer Style‘.

Edit Layer Style Photoshop Elements 10

Once you click on ‘Edit layer style’, Style settings dialog box shows up. Here we have to just select ‘Drop shadow‘ option. And some more settings appear on screen like size, distance, opacity, lighting angle.

You can experiment with the sliders and check the results to learn more about it. Check the animation below to understand how drop shadow works in Photoshop Elements 10.

Drop Shadow - Photoshop Elements 10

The GIF above explains the usage of size, distance and lighting angle option. But one option remains, which is the opacity. Opacity will determine the opaqueness of layer. When Opacity is 100 percent, layer is totally visible. But as opacity is decreased, the layer starts to fade and becomes transparent.

This is how you can add shadow or more precisely drop shadow to the text layer in Photoshop Elements 10. This is not just limited to text layers but its going to work for every type of layer(images, shapes, etc).

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