Tuesday May 22, 2018
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Did you wish Twitter happy birthday? Social media site turns nine

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By Newsgram Staff Writer

How many people can you engage if you are only allowed to speak 140 words?  Those who are on Twitter, know that in such a case, sky is the limit.

Twitter which started on March 21, 2006 and has more than 284 million users worldwide, has turned into a preadolescent 9 year old today.

Started as an SMS service called ‘Twttr’,  to communicate with a small group by a New York University undergrad Jack Dorsey, it has come a long way from there. Today Twitter is not only used by a major chunk of the world population but also used by organizations, including Governments to break news to people. From India’s PMO to NASA all are using Twitter as the next generation communication tool.

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SpaceX to Launch Twin NASA Water Cycle Tracker Satellites

The satellites are scheduled to launch at 3.47 p.m. EDT from Vandenberg Air Force Base in Central California

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SpaceX to Launch Twin NASA Water Cycle Tracker Satellites
SpaceX to Launch Twin NASA Water Cycle Tracker Satellites. Pixabay

On its way to deploy five Iridium Next communications satellites on Tuesday, a SpaceX Falcon 9 rocket will also launch twin NASA satellites that will monitor Earth’s water cycle, marking a unique rideshare arrangement.

The satellites are scheduled to launch at 3.47 p.m. EDT from Vandenberg Air Force Base in Central California. (This corresponds to 1.17 a.m. Wednesday India time), NASA said.

The two Gravity Recovery and Climate Experiment Follow-On mission (GRACE-FO) spacecraft will follow each other in orbit around Earth, separated by about 220 km.

On liftoff, the Falcon 9 first-stage engines will burn for approximately two minutes and 45 seconds before shutting down at main engine cutoff (MECO).

The Falcon 9’s first and second stages will separate seconds later. Then, the second-stage engine will ignite for the first time (SES1) and burn until the vehicle reaches the altitude of the injection orbit, 490 km.

NASA
Representational Image, VOA

While this burn is going on, the payload fairing — the launch vehicle’s nose cone — will separate into two halves like a clamshell and fall away.

When the rocket’s second stage has completed its ascent to the injection orbit altitude, it will pitch down (its nose points down) 30 degrees and roll so that one of the twin GRACE-FO satellites is facing down, toward Earth, and the other is facing up, toward space.

Then the second stage engine will cut off (SECO).

About 10 minutes after liftoff, a separation system on the second stage will deploy the GRACE-FO satellites.

Separation will occur over the Pacific Ocean at about 17.5 degrees North latitude, 122.6 degrees West longitude.

The first opportunity to receive data from the spacecraft will occur at NASA’s tracking station at McMurdo, Antarctica, about 23 minutes after separation, NASA said.

Also Read: A Study by NASA Shows Freshwater Decline in India

After the GRACE-FO satellites are deployed, the Falcon 9 second stage will coast for half an orbit before reigniting its engine (SES2) to take the Iridium Next satellites to a higher orbit for deployment.

GRACE-FO, a collaborative mission of NASA and the German Research Centre for Geosciences (GFZ), continues the work of the original GRACE mission in observing the movement of water and other mass around our planet by tracking the changing pull of gravity very precisely. (IANS)

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