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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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6 votes
2 answers
2k views

How did sulphur come up to the surface of the moon?

We know that the Chandrayaan-3 mission found the presence of sulphur on the surface of the moon. How did it come up to the surface of the moon if this element is supposed to be in the moon's core ...
13 votes
1 answer
590 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 ...
9 votes
1 answer
1k 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: ...
11 votes
3 answers
3k views

GSLV MK2 vs Falcon 9 - Reasons for Huge performance difference

Yesterday ISRO operated the GSLV MK2 launch vehicle, which is a medium lift launch vehicle with a capability to lift 5 tonnes to LEO. I just compared Falcon 9 with GSLV MK2. Falcon 9 capability to ...
3 votes
1 answer
379 views

Why is ISRO planning to launch Aditya-L1 if NASA has already launched the Parker Solar Probe?

If both the ISRO’s Aditya-L1 and NASA’s Parker Solar Probe have almost the same key objectives, then why is ISRO planning to launch Aditya-L1? Is there a specific reason or purpose for this decision?
7 votes
1 answer
1k views

ISRO’s decision not to participate in the International Space Station Program

ISRO has a well-established and successful space program, with many notable achievements to its credit. However, despite its capabilities and expertise in the field of space exploration, ISRO did not ...
5 votes
1 answer
295 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 (...
2 votes
2 answers
243 views

Where do the separated stages of ISRO Launch Vehicle Mark 3 (LVM3) end up?

ISRO Launch Vehicle Mark 3 (LVM3) is a three stage launch vehicle: First stage – S200 Boosters Second stage – L110 Third stage – C25 Where do each of these stages end up after a launch?
1 vote
0 answers
135 views

Is there any major difference between acceleration of solid propelled and liquid propelled rockets during launch

Few days ago, ISRO launched its PSLV-C53, which had solid first stage. (Clip here) Also, the SpaceX's starlink launched on 24th July, 2022, having liquid first stage. (Clip here) Is there any major ...
1 vote
1 answer
208 views

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?
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?
6 votes
0 answers
96 views

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/...
10 votes
1 answer
478 views

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. ...
3 votes
0 answers
81 views

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 ...
2 votes
1 answer
241 views

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 ...
4 votes
1 answer
287 views

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 ...
5 votes
0 answers
242 views

What was Chandrayaan-1's ground track?

I was looking for a map of Chandrayaan-1's ground track, but I wasn't able to find one. I'm looking for something like this:              &...
28 votes
2 answers
4k views

Does India have plans to explore Mars after Mangalyaan?

The Indian Space Research Organisation (ISRO) is launching a Polar Satellite Launch Vehicle (PSLV) this Tuesday (5 Nov 2013) from Satish Dhawan Space Center, Sriharikota, India, flying on the PSLV-C25 ...
3 votes
0 answers
163 views

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 ...
4 votes
1 answer
169 views

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 ...
2 votes
0 answers
110 views

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.
28 votes
2 answers
3k 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 ...
40 votes
3 answers
12k views

Why is China still not invited to the ISS? (Or, why do certain countries not get invited/rejected to work on the ISS?)

I understand that U.S. Congress passed a law in 2011 barring space agency collaboration with CNSA because of concerns over "national security". I also get that China blew-up one of their own ...
36 votes
2 answers
5k views

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 ...
0 votes
1 answer
104 views

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 ...
-3 votes
1 answer
143 views

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 ...
27 votes
3 answers
5k views

Why do some rockets not ignite all their engines during liftoff? (GSLV MK3 LV)

As I understand it, a rocket should produce its maximum thrust on liftoff. As time progresses, the mass of the rocket will decrease, but since the engines produce the same thrust, the rocket will ...
5 votes
1 answer
327 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?
2 votes
0 answers
241 views

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 ...
2 votes
1 answer
403 views

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?
4 votes
2 answers
634 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. ...
8 votes
1 answer
943 views

What specifications is the ISRO crew module fabricated to?

http://www.thehindubusinessline.com/news/science/human-space-flight-prog-hal-hands-over-crew-module-assembly-to-isro/article5685195.ece writes to say Hindustan Aeronautics Ltd (HAL) has handed ...
10 votes
1 answer
304 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 ...
13 votes
3 answers
923 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 ...
35 votes
6 answers
10k views

Why is there a "coasting" phase in some space launches?

During the PSLV (India's Polar Satellite Launch Vehicle) C24 launch on 4 April 2014, once stage 3 (PS3) had burned out, it wasn't immediately jettisoned, but instead there was a coasting phase for ...
7 votes
1 answer
237 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 ...
16 votes
1 answer
575 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 ...
2 votes
1 answer
479 views

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 (...
7 votes
3 answers
765 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 ...
9 votes
2 answers
2k views

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 ...
40 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 ...
7 votes
1 answer
512 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 ...
5 votes
2 answers
257 views

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 ...
8 votes
1 answer
378 views

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 ...
1 vote
2 answers
548 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 ...
4 votes
1 answer
418 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 ...
35 votes
6 answers
9k views

Why should space probes have to orbit the Earth before being launched at other planets?

I'm curious to know why any satellites that need to be sent to other planets should be moving around the Earth rather than directly going towards their destination? Today, India launched one satellite ...
5 votes
2 answers
446 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?
1 vote
0 answers
61 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 ...
7 votes
2 answers
643 views

Methane detection on Mars by MOM?

It's been almost a month since the ISRO's Mars Orbiter Mission (MOM) was put into orbit. Though it doesn't carry much scientific payload, the one most talked about is the methane sensor, which even ...