Questions tagged [isro]

Questions about Indian Space Research Organization (ISRO), its missions, research projects, and other activities financed, organized, planned, managed, or otherwise arranged under this organization's umbrella.

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How many lives have space agencies saved? [closed]

Either the agencies themselves, lives saved by a satelitte launched by them, or how many people would have died if not for space services. How many lives have space agencies saved?
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29 votes
6 answers
9k views

Has any space agency saved Earth from a major calamity any time?

Like diverting meteor path away from Earth, or blasting giant asteroid which was expected to impact Earth, etc. Has any space agency saved Earth from a major calamity at any time?
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10 votes
1 answer
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What are the advantages of air lit solid boosters in PSLV XL?

ISRO's PSLV-XL has 6 solid strap on boosters. In a typical flight profile 4 strap on boosters are lit on ground just before liftoff. The remaining two boosters are lift 25 seconds later in air. ...
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3 votes
0 answers
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Info needed on PSLV launch adaptors and configurations

I want to understand how satellites are accommodated in PSLV. I know about few configurations and adaptors that've been used in the past. Is there any document which gives detailed info on Multiple ...
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2 votes
1 answer
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How did India get to the Mars?

A few years back ISRO sent their orbiter to the Mars, It is known to be the biggest feat achieved by Indian Space Research Organization over the years. It special because ISRO manage to pull this out ...
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6 votes
0 answers
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Has there ever been a non-negligible probability of conjunction between spacecrafts in Lunar orbit?

Apparently ISRO's Chandrayaan-2 orbiter and NASA's LRO narrowly avoided a possible conjunction event in Lunar orbit due to timely assessment and action of both agencies. https://www.isro.gov.in/update/...
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4 votes
1 answer
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How can I become an astronaut?

For EU citizens to envisage a career in space, as an astronaut, the following ESA handbook gives details about the selection process. Similar information for US citizens can be found at this NASA site ...
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3 votes
0 answers
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Did India purchase the Gaganyaan design from Russia?

Gaganyaan is an orbital crew module under development by the Indian Space Research Organisation. Sources indicate a design based on the Russian Soyuz: As of 2015 the design utilized a Soyuz-shaped ...
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4 votes
1 answer
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Does Article VI of the Outer Space Treaty apply to a Launching State?

The following question was asked and answered 3 years ago: might ISRO’s launch of Swarm’s satellites in 2018 be at least a technical violation of the Outer Space Treaty? Recall that the launch in ...
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2 votes
0 answers
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Do sounding rockets need a license to be launched?

I am just curious to know if any kind of license is needed to launch a sounding rocket? If yes, then what kind of licenses are there for sounding rocket launches.
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28 votes
2 answers
2k views

Why does the Indian PSLV rocket have tiny boosters?

I have noticed that the Indian rocket PSLV has tiny strap-on boosters attached to it on the sides at the bottom. Why would these be used instead of just using a larger first stage? Why is there an ...
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36 votes
2 answers
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Why it's news that SOFIA found water when it's already been found?

Back in 2008, India proved water on moon. India's ISRO spacecraft Chandrayaan-1 released the Moon Impact Probe (MIP) that impacted Shackleton Crater, of the lunar south pole, at 20:31 on 14 November ...
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0 votes
1 answer
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Is there any live classes for learning about Mars and Universe by professionals?

I have 10 year old son and he is crazy about Mars, Space, Blackholes, Universe , Rockets, and Satellites. Right now he goes to youtube and tries to learn. But we don't know which video is good and ...
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-2 votes
1 answer
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What's the purpose of space exploration to humans? [closed]

I don't understand why NASA, European Space Agency, ISRO etc. spend enormous amount of money/time on space exploration. Why can't they spend it on the medical side and invent vaccines to incurable ...
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4 votes
2 answers
522 views

Why was ISRO's CARE reentry demonstration at 5300 m/s so slow?

This community wiki answer to What are some details of ISRO's Gaganyaan Mission currently says: Crew Module Atmospheric Re-entry Experiment (CARE) was launched on 18 December 2014 at 04:00 UTC. ...
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2 votes
1 answer
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What are some details of ISRO's Gaganyaan Mission?

What are the some design features of Indian Human spaceflight Programme's Gaganyaan capsule? How much of the testing is done and what are its future plans?
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10 votes
1 answer
240 views

What went wrong in the Chandrayaan-2 mission with the Vikram lander?

On September 7th 2019, ISRO attempted to land a lunar lander ,Vikram, with rover , Pragyan, on the moon. It was very exciting to watch until the lander lost communication with ground station during ...
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1 vote
1 answer
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What is the purpose of the pairs of cylinders on the interstage of PSLV?

In the following images, it can be seen that the interstage (separating the first stage PS1 and the second stage PS2) of the Indian Space Research Organisation's (ISRO) Polar Satellite Launch Vehicle (...
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6 votes
3 answers
733 views

Why is the Duration of Time spent in the Dayside greater than that of the Night side of the Moon for Chandrayaan-2 Orbiter?

The following information is from ISRO's webpage on "Detection of Argon-40 in the lunar exosphere" (Textual information relevant to my question is in bold face): The Chandra’s Atmospheric ...
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11 votes
1 answer
379 views

What is the utility of this peanut-shaped ground facility?

The following image is from GSLV-F11 GSAT-7A Mission: Location: Second Launch Pad (SLP), Satish Dhawan Space Centre, Sriharikota, India. Please click here in case you want to see the image in ISRO's ...
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9 votes
2 answers
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Why would thermal imaging be used to locate the Chandrayaan-2 lander?

Tweets and news suggest that Chandrayaan-2 lander may have been located, using thermal imaging by the Chandrayaan-2 orbiter. Space.com: India Just Found Its Lost Vikram Lander on the Moon, Still No ...
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5 votes
2 answers
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Chandrayaan 2: How has life of the orbiter increased from 1 year to more than 7 years?

https://timesofindia.indiatimes.com/india/chandrayaan-2-orbiter-has-life-of-7-yrs-95-of-mission-accomplished-isro/articleshow/71026990.cms The ISRO Chairman has reported that the economic use of fuel ...
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39 votes
4 answers
7k views

Are there any space probes or landers which regained communication after being lost?

Recently, ISRO Vikram lander of Chandrayaan 2 lost its communication just before 2.1 km from lunar surface. ISRO staff still trying to regain the signals. Are there any space probes/landers which ...
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7 votes
1 answer
345 views

What are the operating systems and network stack in the Chandrayaan - 2 vehicles?

I am trying to find the information about the operating systems that are run in all of the Chandrayaan - 2 vehicles, the orbiter, lander and Rover. Are these just firmwares? Or how are different ...
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7 votes
1 answer
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Did the cold temperature of the lunar south pole cause Chandrayaan-2's on board electronics to fail?

Chandrayaan-2's lander Vikram was performing nominally during descent until about 2 km before landing, but then suddenly the communication was lost. Did cold temperature of the lunar south pole cause ...
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16 votes
1 answer
546 views

Is there any way to determine the fate of Chandrayaan-2?

The lander Vikram of Chandrayaan-2 lost contact with ISRO shortly before an expected landing. Is there any way to find out if it landed without crashing? For example, are there satellites orbiting ...
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5 votes
2 answers
424 views

Launch capabilities of GSLV Mark III

What are the parameters of determining the launch capabilities of a rocket? Also, How does ISRO's GSLV Mark III fare against rockets like N-1, Proton, R-7 etc?
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1 vote
0 answers
58 views

What does it take to create a space startup in India? [closed]

I wish to create a space startup in my country. Does going to an existing space company(like ISRO) help me as a founder for my startup? Consider that I have enough investment and I am ready to take ...
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1 vote
2 answers
489 views

Chandrayaan-2 orbiter and lander communications with Earth (IDSN)

In the Seeker video India Could Be the First to Land on the Moon’s South Pole a bit after 04:20 the narrator says: Okay, well right about now you’re probably ...
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4 votes
1 answer
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Chandrayaan-2; time taken to get to the Moon

Depicted above is the print version of the July 02, 2019 Times of India article Why the world keeps returning to Chandamama which nicely surveys the large number of missions to the Moon. India is ...
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4 votes
1 answer
395 views

Does this rocket engine test run look healthy?

The new Ariane 6's upper stage engine "Vinci" is expected to challenge the RL-10C, which is currently the most efficient chemical rocket engine on the market. The European aerospace conglomerate aims ...
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2 votes
0 answers
164 views

Why does the PSLV first stage's exhaust plume turn to bluish at high altitude?

After few seconds, post liftoff(anywhere between 60s and 90s), the exhaust plume of PSLV turns into a bluish colour. This is quite evident in night launches than day launches(obviously because the ...
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7 votes
1 answer
704 views

Why does PSLV use four stages to get to LEO, and why do they alternate solid, liquid, solid, liquid?

Is there a simple way to explain why ISRO's PSLV launch vehicle uses four stages to get to LEO, and why they alternate as follows: ...
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4 votes
1 answer
208 views

help understanding this complicated structure that will deploy HySIS

This ISRO page for the HysYS spacecraft says: HysIS, the primary satellite of PSLV-C43 mission, weighing about 380 kg, is an earth observation satellite configured around ISRO’s Mini Satellite-2 (...
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5 votes
1 answer
241 views

Acceleration Profile of PSLV and GSLV

What is the way to find out the acceleration profiles of IRSO's GSLV and PSLV from launch until achieving orbit?
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0 votes
0 answers
145 views

Why would ISRO's MOM-2 Mars orbiter mission's apoarion already be decided in such an early call for proposals?

ISRO's announcement Announcement of Opportunity (AO) for future Mars Orbiter Mission (MOM-2) says in part: It is now planned to have the next orbiter mission around Mars for a future launch ...
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5 votes
2 answers
405 views

Why does only SpaceX release every stage of rocket launch for the public viewing?

What I mean is SpaceX telecast every stage of rocket launch. But in NASA and ISRO, they just telecast rocket ignition launch. ISRO and NASA never does this thing why so?
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4 votes
2 answers
325 views

Why is ISRO Launch Escape System so SLOW?

I've just watched a video of the recent test and one thing I noticed is that comparing to other LES, like Mercury, Dragon, Soyuz, it looks really sluggy - like it has like 1.3-1.5 TWR. For pad abort, ...
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37 votes
1 answer
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What kind of orbit makes this wave shaped ground track?

Here is a screen shot from NY2O of the ground track from GSAT-6A (43241, 2018-027A). What kind of orbit can make this wave shaped ground track?
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  • 148k
5 votes
2 answers
498 views

Which ISRO satellite was built in 24 hours?

In the video New ISRO Chief Rocket Man Sivan K, A Farmer's Son, Takes On SpaceX after about 08:33 the interviewer asks ISRO's chairperson Kailasavadivoo Sivan about ...
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2 votes
1 answer
835 views

Why is ISRO's PSLV named "Polar"? Are there challenges for other inclinations?

The "P" in ISRO's PSLV stands for "Polar". Is there anything particularly "polar" about this launch vehicle, or is the use of the word in the name of the rocket more historical or for marketing ...
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  • 148k
7 votes
1 answer
1k views

What are the falling parts in this ISRO rocket launch?

ISRO launched IRNSS-1I satellite yesterday using its versatile PSLV-XL. In the launch video (from 00:35 to 00:40), within five seconds of the launch, many large parts of the rocket are seen to be ...
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4 votes
1 answer
64 views

What are the regulatory steps to be taken by a private aerospace company in India to launch a satellite?

The idea is to launch a satellite with ISRO or any other foreign launch service provider like SpaceX. The satellite in question is a simple CubeSat for basic remote sensing.
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2 votes
1 answer
50 views

Users of GSAT-6A or similar communication satellites

Who are the actual users of the recently launched GSAT-6A(or similar communication satellites). Are these satellites only for millitary communication(using satellite phones)? I have a suspicion that ...
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13 votes
3 answers
852 views

Might ISRO's 2018-004 launch be at least a technical violation of the Outer Space Treaty by India?

The IEEE News article FCC Accuses Stealthy Startup of Launching Rogue Satellites as well as the question What checks are supposed to be carried out to prevent illegal satellite launches? address the ...
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6 votes
1 answer
4k views

Launching sounding rockets from the magnetic equator (ISRO's Thumba)

The Thumba Equatorial Rocket Launching Station is operated by ISRO for launching sounding rockets because magnetic equator passes through it. Equator gives additional velocity, But what advantage ...
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7 votes
1 answer
223 views

How was it difficult for the PSLV to launch a record of 104 satellites?

Last year, ISRO launched 104 satellites successfully into orbit. People praised it as an 'astounding achievement'. Besides a more complicated-than-usual satellite deployment, what truly was ...
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1 vote
1 answer
206 views

Is there any central world organization which authenticate achievement of various space agencies missions?

Recently Isro's mars orbitor has completed 4 years in mars orbit I guess. I am proud of that as I am Indian. but as curious person I still wonder for proofs of that mars orbitor is still in mars ...
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4 votes
0 answers
237 views

Is ISRO Making a Methane Engine?

I'd read some stray comment on the internet claiming that ISRO is working on a methane-LOX engine, just as a technology demonstrator. Is this true?
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2 votes
0 answers
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How have the 'gift' transponders on ISRO's GSAT-9 been used by other countries?

edit: It's been seven months. close to two years close to two years and seven months over three years now, have any of the 'gift' transponders been used or at least tested yet by the gift recipient ...
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